(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.graphlib = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
        /**
         * Copyright (c) 2014, Chris Pettitt
         * All rights reserved.
         *
         * Redistribution and use in source and binary forms, with or without
         * modification, are permitted provided that the following conditions are met:
         *
         * 1. Redistributions of source code must retain the above copyright notice, this
         * list of conditions and the following disclaimer.
         *
         * 2. Redistributions in binary form must reproduce the above copyright notice,
         * this list of conditions and the following disclaimer in the documentation
         * and/or other materials provided with the distribution.
         *
         * 3. Neither the name of the copyright holder nor the names of its contributors
         * may be used to endorse or promote products derived from this software without
         * specific prior written permission.
         *
         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
         * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
         * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
         * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
         * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
         * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
         * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
         * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
         */

        var lib = require("./lib");

        module.exports = {
            Graph: lib.Graph,
            json: require("./lib/json"),
            alg: require("./lib/alg"),
            version: lib.version
        };

    },{"./lib":17,"./lib/alg":8,"./lib/json":18}],2:[function(require,module,exports){
        var _ = require("../lodash");

        module.exports = components;

        function components(g) {
            var visited = {},
                cmpts = [],
                cmpt;

            function dfs(v) {
                if (_.has(visited, v)) return;
                visited[v] = true;
                cmpt.push(v);
                _.each(g.successors(v), dfs);
                _.each(g.predecessors(v), dfs);
            }

            _.each(g.nodes(), function(v) {
                cmpt = [];
                dfs(v);
                if (cmpt.length) {
                    cmpts.push(cmpt);
                }
            });

            return cmpts;
        }

    },{"../lodash":19}],3:[function(require,module,exports){
        var _ = require("../lodash");

        module.exports = dfs;

        /*
 * A helper that preforms a pre- or post-order traversal on the input graph
 * and returns the nodes in the order they were visited. If the graph is
 * undirected then this algorithm will navigate using neighbors. If the graph
 * is directed then this algorithm will navigate using successors.
 *
 * Order must be one of "pre" or "post".
 */
        function dfs(g, vs, order) {
            if (!_.isArray(vs)) {
                vs = [vs];
            }

            var navigation = (g.isDirected() ? g.successors : g.neighbors).bind(g);

            var acc = [],
                visited = {};
            _.each(vs, function(v) {
                if (!g.hasNode(v)) {
                    throw new Error("Graph does not have node: " + v);
                }

                doDfs(g, v, order === "post", visited, navigation, acc);
            });
            return acc;
        }

        function doDfs(g, v, postorder, visited, navigation, acc) {
            if (!_.has(visited, v)) {
                visited[v] = true;

                if (!postorder) { acc.push(v); }
                _.each(navigation(v), function(w) {
                    doDfs(g, w, postorder, visited, navigation, acc);
                });
                if (postorder) { acc.push(v); }
            }
        }

    },{"../lodash":19}],4:[function(require,module,exports){
        var dijkstra = require("./dijkstra"),
            _ = require("../lodash");

        module.exports = dijkstraAll;

        function dijkstraAll(g, weightFunc, edgeFunc) {
            return _.transform(g.nodes(), function(acc, v) {
                acc[v] = dijkstra(g, v, weightFunc, edgeFunc);
            }, {});
        }

    },{"../lodash":19,"./dijkstra":5}],5:[function(require,module,exports){
        var _ = require("../lodash"),
            PriorityQueue = require("../data/priority-queue");

        module.exports = dijkstra;

        var DEFAULT_WEIGHT_FUNC = _.constant(1);

        function dijkstra(g, source, weightFn, edgeFn) {
            return runDijkstra(g, String(source),
                weightFn || DEFAULT_WEIGHT_FUNC,
                edgeFn || function(v) { return g.outEdges(v); });
        }

        function runDijkstra(g, source, weightFn, edgeFn) {
            var results = {},
                pq = new PriorityQueue(),
                v, vEntry;

            var updateNeighbors = function(edge) {
                var w = edge.v !== v ? edge.v : edge.w,
                    wEntry = results[w],
                    weight = weightFn(edge),
                    distance = vEntry.distance + weight;

                if (weight < 0) {
                    throw new Error("dijkstra does not allow negative edge weights. " +
                        "Bad edge: " + edge + " Weight: " + weight);
                }

                if (distance < wEntry.distance) {
                    wEntry.distance = distance;
                    wEntry.predecessor = v;
                    pq.decrease(w, distance);
                }
            };

            g.nodes().forEach(function(v) {
                var distance = v === source ? 0 : Number.POSITIVE_INFINITY;
                results[v] = { distance: distance };
                pq.add(v, distance);
            });

            while (pq.size() > 0) {
                v = pq.removeMin();
                vEntry = results[v];
                if (vEntry.distance === Number.POSITIVE_INFINITY) {
                    break;
                }

                edgeFn(v).forEach(updateNeighbors);
            }

            return results;
        }

    },{"../data/priority-queue":15,"../lodash":19}],6:[function(require,module,exports){
        var _ = require("../lodash"),
            tarjan = require("./tarjan");

        module.exports = findCycles;

        function findCycles(g) {
            return _.filter(tarjan(g), function(cmpt) {
                return cmpt.length > 1 || (cmpt.length === 1 && g.hasEdge(cmpt[0], cmpt[0]));
            });
        }

    },{"../lodash":19,"./tarjan":13}],7:[function(require,module,exports){
        var _ = require("../lodash");

        module.exports = floydWarshall;

        var DEFAULT_WEIGHT_FUNC = _.constant(1);

        function floydWarshall(g, weightFn, edgeFn) {
            return runFloydWarshall(g,
                weightFn || DEFAULT_WEIGHT_FUNC,
                edgeFn || function(v) { return g.outEdges(v); });
        }

        function runFloydWarshall(g, weightFn, edgeFn) {
            var results = {},
                nodes = g.nodes();

            nodes.forEach(function(v) {
                results[v] = {};
                results[v][v] = { distance: 0 };
                nodes.forEach(function(w) {
                    if (v !== w) {
                        results[v][w] = { distance: Number.POSITIVE_INFINITY };
                    }
                });
                edgeFn(v).forEach(function(edge) {
                    var w = edge.v === v ? edge.w : edge.v,
                        d = weightFn(edge);
                    results[v][w] = { distance: d, predecessor: v };
                });
            });

            nodes.forEach(function(k) {
                var rowK = results[k];
                nodes.forEach(function(i) {
                    var rowI = results[i];
                    nodes.forEach(function(j) {
                        var ik = rowI[k];
                        var kj = rowK[j];
                        var ij = rowI[j];
                        var altDistance = ik.distance + kj.distance;
                        if (altDistance < ij.distance) {
                            ij.distance = altDistance;
                            ij.predecessor = kj.predecessor;
                        }
                    });
                });
            });

            return results;
        }

    },{"../lodash":19}],8:[function(require,module,exports){
        module.exports = {
            components: require("./components"),
            dijkstra: require("./dijkstra"),
            dijkstraAll: require("./dijkstra-all"),
            findCycles: require("./find-cycles"),
            floydWarshall: require("./floyd-warshall"),
            isAcyclic: require("./is-acyclic"),
            postorder: require("./postorder"),
            preorder: require("./preorder"),
            prim: require("./prim"),
            tarjan: require("./tarjan"),
            topsort: require("./topsort")
        };

    },{"./components":2,"./dijkstra":5,"./dijkstra-all":4,"./find-cycles":6,"./floyd-warshall":7,"./is-acyclic":9,"./postorder":10,"./preorder":11,"./prim":12,"./tarjan":13,"./topsort":14}],9:[function(require,module,exports){
        var topsort = require("./topsort");

        module.exports = isAcyclic;

        function isAcyclic(g) {
            try {
                topsort(g);
            } catch (e) {
                if (e instanceof topsort.CycleException) {
                    return false;
                }
                throw e;
            }
            return true;
        }

    },{"./topsort":14}],10:[function(require,module,exports){
        var dfs = require("./dfs");

        module.exports = postorder;

        function postorder(g, vs) {
            return dfs(g, vs, "post");
        }

    },{"./dfs":3}],11:[function(require,module,exports){
        var dfs = require("./dfs");

        module.exports = preorder;

        function preorder(g, vs) {
            return dfs(g, vs, "pre");
        }

    },{"./dfs":3}],12:[function(require,module,exports){
        var _ = require("../lodash"),
            Graph = require("../graph"),
            PriorityQueue = require("../data/priority-queue");

        module.exports = prim;

        function prim(g, weightFunc) {
            var result = new Graph(),
                parents = {},
                pq = new PriorityQueue(),
                v;

            function updateNeighbors(edge) {
                var w = edge.v === v ? edge.w : edge.v,
                    pri = pq.priority(w);
                if (pri !== undefined) {
                    var edgeWeight = weightFunc(edge);
                    if (edgeWeight < pri) {
                        parents[w] = v;
                        pq.decrease(w, edgeWeight);
                    }
                }
            }

            if (g.nodeCount() === 0) {
                return result;
            }

            _.each(g.nodes(), function(v) {
                pq.add(v, Number.POSITIVE_INFINITY);
                result.setNode(v);
            });

            // Start from an arbitrary node
            pq.decrease(g.nodes()[0], 0);

            var init = false;
            while (pq.size() > 0) {
                v = pq.removeMin();
                if (_.has(parents, v)) {
                    result.setEdge(v, parents[v]);
                } else if (init) {
                    throw new Error("Input graph is not connected: " + g);
                } else {
                    init = true;
                }

                g.nodeEdges(v).forEach(updateNeighbors);
            }

            return result;
        }

    },{"../data/priority-queue":15,"../graph":16,"../lodash":19}],13:[function(require,module,exports){
        var _ = require("../lodash");

        module.exports = tarjan;

        function tarjan(g) {
            var index = 0,
                stack = [],
                visited = {}, // node id -> { onStack, lowlink, index }
                results = [];

            function dfs(v) {
                var entry = visited[v] = {
                    onStack: true,
                    lowlink: index,
                    index: index++
                };
                stack.push(v);

                g.successors(v).forEach(function(w) {
                    if (!_.has(visited, w)) {
                        dfs(w);
                        entry.lowlink = Math.min(entry.lowlink, visited[w].lowlink);
                    } else if (visited[w].onStack) {
                        entry.lowlink = Math.min(entry.lowlink, visited[w].index);
                    }
                });

                if (entry.lowlink === entry.index) {
                    var cmpt = [],
                        w;
                    do {
                        w = stack.pop();
                        visited[w].onStack = false;
                        cmpt.push(w);
                    } while (v !== w);
                    results.push(cmpt);
                }
            }

            g.nodes().forEach(function(v) {
                if (!_.has(visited, v)) {
                    dfs(v);
                }
            });

            return results;
        }

    },{"../lodash":19}],14:[function(require,module,exports){
        var _ = require("../lodash");

        module.exports = topsort;
        topsort.CycleException = CycleException;

        function topsort(g) {
            var visited = {},
                stack = {},
                results = [];

            function visit(node) {
                if (_.has(stack, node)) {
                    throw new CycleException();
                }

                if (!_.has(visited, node)) {
                    stack[node] = true;
                    visited[node] = true;
                    _.each(g.predecessors(node), visit);
                    delete stack[node];
                    results.push(node);
                }
            }

            _.each(g.sinks(), visit);

            if (_.size(visited) !== g.nodeCount()) {
                throw new CycleException();
            }

            return results;
        }

        function CycleException() {}

    },{"../lodash":19}],15:[function(require,module,exports){
        var _ = require("../lodash");

        module.exports = PriorityQueue;

        /**
         * A min-priority queue data structure. This algorithm is derived from Cormen,
         * et al., "Introduction to Algorithms". The basic idea of a min-priority
         * queue is that you can efficiently (in O(1) time) get the smallest key in
         * the queue. Adding and removing elements takes O(log n) time. A key can
         * have its priority decreased in O(log n) time.
         */
        function PriorityQueue() {
            this._arr = [];
            this._keyIndices = {};
        }

        /**
         * Returns the number of elements in the queue. Takes `O(1)` time.
         */
        PriorityQueue.prototype.size = function() {
            return this._arr.length;
        };

        /**
         * Returns the keys that are in the queue. Takes `O(n)` time.
         */
        PriorityQueue.prototype.keys = function() {
            return this._arr.map(function(x) { return x.key; });
        };

        /**
         * Returns `true` if **key** is in the queue and `false` if not.
         */
        PriorityQueue.prototype.has = function(key) {
            return _.has(this._keyIndices, key);
        };

        /**
         * Returns the priority for **key**. If **key** is not present in the queue
         * then this function returns `undefined`. Takes `O(1)` time.
         *
         * @param {Object} key
         */
        PriorityQueue.prototype.priority = function(key) {
            var index = this._keyIndices[key];
            if (index !== undefined) {
                return this._arr[index].priority;
            }
        };

        /**
         * Returns the key for the minimum element in this queue. If the queue is
         * empty this function throws an Error. Takes `O(1)` time.
         */
        PriorityQueue.prototype.min = function() {
            if (this.size() === 0) {
                throw new Error("Queue underflow");
            }
            return this._arr[0].key;
        };

        /**
         * Inserts a new key into the priority queue. If the key already exists in
         * the queue this function returns `false`; otherwise it will return `true`.
         * Takes `O(n)` time.
         *
         * @param {Object} key the key to add
         * @param {Number} priority the initial priority for the key
         */
        PriorityQueue.prototype.add = function(key, priority) {
            var keyIndices = this._keyIndices;
            key = String(key);
            if (!_.has(keyIndices, key)) {
                var arr = this._arr;
                var index = arr.length;
                keyIndices[key] = index;
                arr.push({key: key, priority: priority});
                this._decrease(index);
                return true;
            }
            return false;
        };

        /**
         * Removes and returns the smallest key in the queue. Takes `O(log n)` time.
         */
        PriorityQueue.prototype.removeMin = function() {
            this._swap(0, this._arr.length - 1);
            var min = this._arr.pop();
            delete this._keyIndices[min.key];
            this._heapify(0);
            return min.key;
        };

        /**
         * Decreases the priority for **key** to **priority**. If the new priority is
         * greater than the previous priority, this function will throw an Error.
         *
         * @param {Object} key the key for which to raise priority
         * @param {Number} priority the new priority for the key
         */
        PriorityQueue.prototype.decrease = function(key, priority) {
            var index = this._keyIndices[key];
            if (priority > this._arr[index].priority) {
                throw new Error("New priority is greater than current priority. " +
                    "Key: " + key + " Old: " + this._arr[index].priority + " New: " + priority);
            }
            this._arr[index].priority = priority;
            this._decrease(index);
        };

        PriorityQueue.prototype._heapify = function(i) {
            var arr = this._arr;
            var l = 2 * i,
                r = l + 1,
                largest = i;
            if (l < arr.length) {
                largest = arr[l].priority < arr[largest].priority ? l : largest;
                if (r < arr.length) {
                    largest = arr[r].priority < arr[largest].priority ? r : largest;
                }
                if (largest !== i) {
                    this._swap(i, largest);
                    this._heapify(largest);
                }
            }
        };

        PriorityQueue.prototype._decrease = function(index) {
            var arr = this._arr;
            var priority = arr[index].priority;
            var parent;
            while (index !== 0) {
                parent = index >> 1;
                if (arr[parent].priority < priority) {
                    break;
                }
                this._swap(index, parent);
                index = parent;
            }
        };

        PriorityQueue.prototype._swap = function(i, j) {
            var arr = this._arr;
            var keyIndices = this._keyIndices;
            var origArrI = arr[i];
            var origArrJ = arr[j];
            arr[i] = origArrJ;
            arr[j] = origArrI;
            keyIndices[origArrJ.key] = i;
            keyIndices[origArrI.key] = j;
        };

    },{"../lodash":19}],16:[function(require,module,exports){
        "use strict";

        var _ = require("./lodash");

        module.exports = Graph;

        var DEFAULT_EDGE_NAME = "\x00",
            GRAPH_NODE = "\x00",
            EDGE_KEY_DELIM = "\x01";

// Implementation notes:
//
//  * Node id query functions should return string ids for the nodes
//  * Edge id query functions should return an "edgeObj", edge object, that is
//    composed of enough information to uniquely identify an edge: {v, w, name}.
//  * Internally we use an "edgeId", a stringified form of the edgeObj, to
//    reference edges. This is because we need a performant way to look these
//    edges up and, object properties, which have string keys, are the closest
//    we're going to get to a performant hashtable in JavaScript.

        function Graph(opts) {
            this._isDirected = _.has(opts, "directed") ? opts.directed : true;
            this._isMultigraph = _.has(opts, "multigraph") ? opts.multigraph : false;
            this._isCompound = _.has(opts, "compound") ? opts.compound : false;

            // Label for the graph itself
            this._label = undefined;

            // Defaults to be set when creating a new node
            this._defaultNodeLabelFn = _.constant(undefined);

            // Defaults to be set when creating a new edge
            this._defaultEdgeLabelFn = _.constant(undefined);

            // v -> label
            this._nodes = {};

            if (this._isCompound) {
                // v -> parent
                this._parent = {};

                // v -> children
                this._children = {};
                this._children[GRAPH_NODE] = {};
            }

            // v -> edgeObj
            this._in = {};

            // u -> v -> Number
            this._preds = {};

            // v -> edgeObj
            this._out = {};

            // v -> w -> Number
            this._sucs = {};

            // e -> edgeObj
            this._edgeObjs = {};

            // e -> label
            this._edgeLabels = {};
        }

        /* Number of nodes in the graph. Should only be changed by the implementation. */
        Graph.prototype._nodeCount = 0;

        /* Number of edges in the graph. Should only be changed by the implementation. */
        Graph.prototype._edgeCount = 0;


        /* === Graph functions ========= */

        Graph.prototype.isDirected = function() {
            return this._isDirected;
        };

        Graph.prototype.isMultigraph = function() {
            return this._isMultigraph;
        };

        Graph.prototype.isCompound = function() {
            return this._isCompound;
        };

        Graph.prototype.setGraph = function(label) {
            this._label = label;
            return this;
        };

        Graph.prototype.graph = function() {
            return this._label;
        };


        /* === Node functions ========== */

        Graph.prototype.setDefaultNodeLabel = function(newDefault) {
            if (!_.isFunction(newDefault)) {
                newDefault = _.constant(newDefault);
            }
            this._defaultNodeLabelFn = newDefault;
            return this;
        };

        Graph.prototype.nodeCount = function() {
            return this._nodeCount;
        };

        Graph.prototype.nodes = function() {
            return _.keys(this._nodes);
        };

        Graph.prototype.sources = function() {
            var self = this;
            return _.filter(this.nodes(), function(v) {
                return _.isEmpty(self._in[v]);
            });
        };

        Graph.prototype.sinks = function() {
            var self = this;
            return _.filter(this.nodes(), function(v) {
                return _.isEmpty(self._out[v]);
            });
        };

        Graph.prototype.setNodes = function(vs, value) {
            var args = arguments;
            var self = this;
            _.each(vs, function(v) {
                if (args.length > 1) {
                    self.setNode(v, value);
                } else {
                    self.setNode(v);
                }
            });
            return this;
        };

        Graph.prototype.setNode = function(v, value) {
            if (_.has(this._nodes, v)) {
                if (arguments.length > 1) {
                    this._nodes[v] = value;
                }
                return this;
            }

            this._nodes[v] = arguments.length > 1 ? value : this._defaultNodeLabelFn(v);
            if (this._isCompound) {
                this._parent[v] = GRAPH_NODE;
                this._children[v] = {};
                this._children[GRAPH_NODE][v] = true;
            }
            this._in[v] = {};
            this._preds[v] = {};
            this._out[v] = {};
            this._sucs[v] = {};
            ++this._nodeCount;
            return this;
        };

        Graph.prototype.node = function(v) {
            return this._nodes[v];
        };

        Graph.prototype.hasNode = function(v) {
            return _.has(this._nodes, v);
        };

        Graph.prototype.removeNode =  function(v) {
            var self = this;
            if (_.has(this._nodes, v)) {
                var removeEdge = function(e) { self.removeEdge(self._edgeObjs[e]); };
                delete this._nodes[v];
                if (this._isCompound) {
                    this._removeFromParentsChildList(v);
                    delete this._parent[v];
                    _.each(this.children(v), function(child) {
                        self.setParent(child);
                    });
                    delete this._children[v];
                }
                _.each(_.keys(this._in[v]), removeEdge);
                delete this._in[v];
                delete this._preds[v];
                _.each(_.keys(this._out[v]), removeEdge);
                delete this._out[v];
                delete this._sucs[v];
                --this._nodeCount;
            }
            return this;
        };

        Graph.prototype.setParent = function(v, parent) {
            if (!this._isCompound) {
                throw new Error("Cannot set parent in a non-compound graph");
            }

            if (_.isUndefined(parent)) {
                parent = GRAPH_NODE;
            } else {
                // Coerce parent to string
                parent += "";
                for (var ancestor = parent;
                     !_.isUndefined(ancestor);
                     ancestor = this.parent(ancestor)) {
                    if (ancestor === v) {
                        throw new Error("Setting " + parent+ " as parent of " + v +
                            " would create a cycle");
                    }
                }

                this.setNode(parent);
            }

            this.setNode(v);
            this._removeFromParentsChildList(v);
            this._parent[v] = parent;
            this._children[parent][v] = true;
            return this;
        };

        Graph.prototype._removeFromParentsChildList = function(v) {
            delete this._children[this._parent[v]][v];
        };

        Graph.prototype.parent = function(v) {
            if (this._isCompound) {
                var parent = this._parent[v];
                if (parent !== GRAPH_NODE) {
                    return parent;
                }
            }
        };

        Graph.prototype.children = function(v) {
            if (_.isUndefined(v)) {
                v = GRAPH_NODE;
            }

            if (this._isCompound) {
                var children = this._children[v];
                if (children) {
                    return _.keys(children);
                }
            } else if (v === GRAPH_NODE) {
                return this.nodes();
            } else if (this.hasNode(v)) {
                return [];
            }
        };

        Graph.prototype.predecessors = function(v) {
            var predsV = this._preds[v];
            if (predsV) {
                return _.keys(predsV);
            }
        };

        Graph.prototype.successors = function(v) {
            var sucsV = this._sucs[v];
            if (sucsV) {
                return _.keys(sucsV);
            }
        };

        Graph.prototype.neighbors = function(v) {
            var preds = this.predecessors(v);
            if (preds) {
                return _.union(preds, this.successors(v));
            }
        };

        Graph.prototype.isLeaf = function (v) {
            var neighbors;
            if (this.isDirected()) {
                neighbors = this.successors(v);
            } else {
                neighbors = this.neighbors(v);
            }
            return neighbors.length === 0;
        };

        Graph.prototype.filterNodes = function(filter) {
            var copy = new this.constructor({
                directed: this._isDirected,
                multigraph: this._isMultigraph,
                compound: this._isCompound
            });

            copy.setGraph(this.graph());

            var self = this;
            _.each(this._nodes, function(value, v) {
                if (filter(v)) {
                    copy.setNode(v, value);
                }
            });

            _.each(this._edgeObjs, function(e) {
                if (copy.hasNode(e.v) && copy.hasNode(e.w)) {
                    copy.setEdge(e, self.edge(e));
                }
            });

            var parents = {};
            function findParent(v) {
                var parent = self.parent(v);
                if (parent === undefined || copy.hasNode(parent)) {
                    parents[v] = parent;
                    return parent;
                } else if (parent in parents) {
                    return parents[parent];
                } else {
                    return findParent(parent);
                }
            }

            if (this._isCompound) {
                _.each(copy.nodes(), function(v) {
                    copy.setParent(v, findParent(v));
                });
            }

            return copy;
        };

        /* === Edge functions ========== */

        Graph.prototype.setDefaultEdgeLabel = function(newDefault) {
            if (!_.isFunction(newDefault)) {
                newDefault = _.constant(newDefault);
            }
            this._defaultEdgeLabelFn = newDefault;
            return this;
        };

        Graph.prototype.edgeCount = function() {
            return this._edgeCount;
        };

        Graph.prototype.edges = function() {
            return _.values(this._edgeObjs);
        };

        Graph.prototype.setPath = function(vs, value) {
            var self = this,
                args = arguments;
            _.reduce(vs, function(v, w) {
                if (args.length > 1) {
                    self.setEdge(v, w, value);
                } else {
                    self.setEdge(v, w);
                }
                return w;
            });
            return this;
        };

        /*
 * setEdge(v, w, [value, [name]])
 * setEdge({ v, w, [name] }, [value])
 */
        Graph.prototype.setEdge = function() {
            var v, w, name, value,
                valueSpecified = false,
                arg0 = arguments[0];

            if (typeof arg0 === "object" && arg0 !== null && "v" in arg0) {
                v = arg0.v;
                w = arg0.w;
                name = arg0.name;
                if (arguments.length === 2) {
                    value = arguments[1];
                    valueSpecified = true;
                }
            } else {
                v = arg0;
                w = arguments[1];
                name = arguments[3];
                if (arguments.length > 2) {
                    value = arguments[2];
                    valueSpecified = true;
                }
            }

            v = "" + v;
            w = "" + w;
            if (!_.isUndefined(name)) {
                name = "" + name;
            }

            var e = edgeArgsToId(this._isDirected, v, w, name);
            if (_.has(this._edgeLabels, e)) {
                if (valueSpecified) {
                    this._edgeLabels[e] = value;
                }
                return this;
            }

            if (!_.isUndefined(name) && !this._isMultigraph) {
                throw new Error("Cannot set a named edge when isMultigraph = false");
            }

            // It didn't exist, so we need to create it.
            // First ensure the nodes exist.
            this.setNode(v);
            this.setNode(w);

            this._edgeLabels[e] = valueSpecified ? value : this._defaultEdgeLabelFn(v, w, name);

            var edgeObj = edgeArgsToObj(this._isDirected, v, w, name);
            // Ensure we add undirected edges in a consistent way.
            v = edgeObj.v;
            w = edgeObj.w;

            Object.freeze(edgeObj);
            this._edgeObjs[e] = edgeObj;
            incrementOrInitEntry(this._preds[w], v);
            incrementOrInitEntry(this._sucs[v], w);
            this._in[w][e] = edgeObj;
            this._out[v][e] = edgeObj;
            this._edgeCount++;
            return this;
        };

        Graph.prototype.edge = function(v, w, name) {
            var e = (arguments.length === 1
                ? edgeObjToId(this._isDirected, arguments[0])
                : edgeArgsToId(this._isDirected, v, w, name));
            return this._edgeLabels[e];
        };

        Graph.prototype.hasEdge = function(v, w, name) {
            var e = (arguments.length === 1
                ? edgeObjToId(this._isDirected, arguments[0])
                : edgeArgsToId(this._isDirected, v, w, name));
            return _.has(this._edgeLabels, e);
        };

        Graph.prototype.removeEdge = function(v, w, name) {
            var e = (arguments.length === 1
                ? edgeObjToId(this._isDirected, arguments[0])
                : edgeArgsToId(this._isDirected, v, w, name)),
                edge = this._edgeObjs[e];
            if (edge) {
                v = edge.v;
                w = edge.w;
                delete this._edgeLabels[e];
                delete this._edgeObjs[e];
                decrementOrRemoveEntry(this._preds[w], v);
                decrementOrRemoveEntry(this._sucs[v], w);
                delete this._in[w][e];
                delete this._out[v][e];
                this._edgeCount--;
            }
            return this;
        };

        Graph.prototype.inEdges = function(v, u) {
            var inV = this._in[v];
            if (inV) {
                var edges = _.values(inV);
                if (!u) {
                    return edges;
                }
                return _.filter(edges, function(edge) { return edge.v === u; });
            }
        };

        Graph.prototype.outEdges = function(v, w) {
            var outV = this._out[v];
            if (outV) {
                var edges = _.values(outV);
                if (!w) {
                    return edges;
                }
                return _.filter(edges, function(edge) { return edge.w === w; });
            }
        };

        Graph.prototype.nodeEdges = function(v, w) {
            var inEdges = this.inEdges(v, w);
            if (inEdges) {
                return inEdges.concat(this.outEdges(v, w));
            }
        };

        function incrementOrInitEntry(map, k) {
            if (map[k]) {
                map[k]++;
            } else {
                map[k] = 1;
            }
        }

        function decrementOrRemoveEntry(map, k) {
            if (!--map[k]) { delete map[k]; }
        }

        function edgeArgsToId(isDirected, v_, w_, name) {
            var v = "" + v_;
            var w = "" + w_;
            if (!isDirected && v > w) {
                var tmp = v;
                v = w;
                w = tmp;
            }
            return v + EDGE_KEY_DELIM + w + EDGE_KEY_DELIM +
                (_.isUndefined(name) ? DEFAULT_EDGE_NAME : name);
        }

        function edgeArgsToObj(isDirected, v_, w_, name) {
            var v = "" + v_;
            var w = "" + w_;
            if (!isDirected && v > w) {
                var tmp = v;
                v = w;
                w = tmp;
            }
            var edgeObj =  { v: v, w: w };
            if (name) {
                edgeObj.name = name;
            }
            return edgeObj;
        }

        function edgeObjToId(isDirected, edgeObj) {
            return edgeArgsToId(isDirected, edgeObj.v, edgeObj.w, edgeObj.name);
        }

    },{"./lodash":19}],17:[function(require,module,exports){
// Includes only the "core" of graphlib
        module.exports = {
            Graph: require("./graph"),
            version: require("./version")
        };

    },{"./graph":16,"./version":20}],18:[function(require,module,exports){
        var _ = require("./lodash"),
            Graph = require("./graph");

        module.exports = {
            write: write,
            read: read
        };

        function write(g) {
            var json = {
                options: {
                    directed: g.isDirected(),
                    multigraph: g.isMultigraph(),
                    compound: g.isCompound()
                },
                nodes: writeNodes(g),
                edges: writeEdges(g)
            };
            if (!_.isUndefined(g.graph())) {
                json.value = _.clone(g.graph());
            }
            return json;
        }

        function writeNodes(g) {
            return _.map(g.nodes(), function(v) {
                var nodeValue = g.node(v),
                    parent = g.parent(v),
                    node = { v: v };
                if (!_.isUndefined(nodeValue)) {
                    node.value = nodeValue;
                }
                if (!_.isUndefined(parent)) {
                    node.parent = parent;
                }
                return node;
            });
        }

        function writeEdges(g) {
            return _.map(g.edges(), function(e) {
                var edgeValue = g.edge(e),
                    edge = { v: e.v, w: e.w };
                if (!_.isUndefined(e.name)) {
                    edge.name = e.name;
                }
                if (!_.isUndefined(edgeValue)) {
                    edge.value = edgeValue;
                }
                return edge;
            });
        }

        function read(json) {
            var g = new Graph(json.options).setGraph(json.value);
            _.each(json.nodes, function(entry) {
                g.setNode(entry.v, entry.value);
                if (entry.parent) {
                    g.setParent(entry.v, entry.parent);
                }
            });
            _.each(json.edges, function(entry) {
                g.setEdge({ v: entry.v, w: entry.w, name: entry.name }, entry.value);
            });
            return g;
        }

    },{"./graph":16,"./lodash":19}],19:[function(require,module,exports){
        /* global window */

        var lodash;

        if (typeof require === "function") {
            try {
                lodash = require("lodash");
            } catch (e) {}
        }

        if (!lodash) {
            lodash = window._;
        }

        module.exports = lodash;

    },{"lodash":21}],20:[function(require,module,exports){
        module.exports = '2.1.5';

    },{}],21:[function(require,module,exports){
        (function (global){
            /**
             * @license
             * Lodash <https://lodash.com/>
             * Copyright JS Foundation and other contributors <https://js.foundation/>
             * Released under MIT license <https://lodash.com/license>
             * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
             * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
             */
            ;(function() {

                /** Used as a safe reference for `undefined` in pre-ES5 environments. */
                var undefined;

                /** Used as the semantic version number. */
                var VERSION = '4.17.4';

                /** Used as the size to enable large array optimizations. */
                var LARGE_ARRAY_SIZE = 200;

                /** Error message constants. */
                var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
                    FUNC_ERROR_TEXT = 'Expected a function';

                /** Used to stand-in for `undefined` hash values. */
                var HASH_UNDEFINED = '__lodash_hash_undefined__';

                /** Used as the maximum memoize cache size. */
                var MAX_MEMOIZE_SIZE = 500;

                /** Used as the internal argument placeholder. */
                var PLACEHOLDER = '__lodash_placeholder__';

                /** Used to compose bitmasks for cloning. */
                var CLONE_DEEP_FLAG = 1,
                    CLONE_FLAT_FLAG = 2,
                    CLONE_SYMBOLS_FLAG = 4;

                /** Used to compose bitmasks for value comparisons. */
                var COMPARE_PARTIAL_FLAG = 1,
                    COMPARE_UNORDERED_FLAG = 2;

                /** Used to compose bitmasks for function metadata. */
                var WRAP_BIND_FLAG = 1,
                    WRAP_BIND_KEY_FLAG = 2,
                    WRAP_CURRY_BOUND_FLAG = 4,
                    WRAP_CURRY_FLAG = 8,
                    WRAP_CURRY_RIGHT_FLAG = 16,
                    WRAP_PARTIAL_FLAG = 32,
                    WRAP_PARTIAL_RIGHT_FLAG = 64,
                    WRAP_ARY_FLAG = 128,
                    WRAP_REARG_FLAG = 256,
                    WRAP_FLIP_FLAG = 512;

                /** Used as default options for `_.truncate`. */
                var DEFAULT_TRUNC_LENGTH = 30,
                    DEFAULT_TRUNC_OMISSION = '...';

                /** Used to detect hot functions by number of calls within a span of milliseconds. */
                var HOT_COUNT = 800,
                    HOT_SPAN = 16;

                /** Used to indicate the type of lazy iteratees. */
                var LAZY_FILTER_FLAG = 1,
                    LAZY_MAP_FLAG = 2,
                    LAZY_WHILE_FLAG = 3;

                /** Used as references for various `Number` constants. */
                var INFINITY = 1 / 0,
                    MAX_SAFE_INTEGER = 9007199254740991,
                    MAX_INTEGER = 1.7976931348623157e+308,
                    NAN = 0 / 0;

                /** Used as references for the maximum length and index of an array. */
                var MAX_ARRAY_LENGTH = 4294967295,
                    MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
                    HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;

                /** Used to associate wrap methods with their bit flags. */
                var wrapFlags = [
                    ['ary', WRAP_ARY_FLAG],
                    ['bind', WRAP_BIND_FLAG],
                    ['bindKey', WRAP_BIND_KEY_FLAG],
                    ['curry', WRAP_CURRY_FLAG],
                    ['curryRight', WRAP_CURRY_RIGHT_FLAG],
                    ['flip', WRAP_FLIP_FLAG],
                    ['partial', WRAP_PARTIAL_FLAG],
                    ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
                    ['rearg', WRAP_REARG_FLAG]
                ];

                /** `Object#toString` result references. */
                var argsTag = '[object Arguments]',
                    arrayTag = '[object Array]',
                    asyncTag = '[object AsyncFunction]',
                    boolTag = '[object Boolean]',
                    dateTag = '[object Date]',
                    domExcTag = '[object DOMException]',
                    errorTag = '[object Error]',
                    funcTag = '[object Function]',
                    genTag = '[object GeneratorFunction]',
                    mapTag = '[object Map]',
                    numberTag = '[object Number]',
                    nullTag = '[object Null]',
                    objectTag = '[object Object]',
                    promiseTag = '[object Promise]',
                    proxyTag = '[object Proxy]',
                    regexpTag = '[object RegExp]',
                    setTag = '[object Set]',
                    stringTag = '[object String]',
                    symbolTag = '[object Symbol]',
                    undefinedTag = '[object Undefined]',
                    weakMapTag = '[object WeakMap]',
                    weakSetTag = '[object WeakSet]';

                var arrayBufferTag = '[object ArrayBuffer]',
                    dataViewTag = '[object DataView]',
                    float32Tag = '[object Float32Array]',
                    float64Tag = '[object Float64Array]',
                    int8Tag = '[object Int8Array]',
                    int16Tag = '[object Int16Array]',
                    int32Tag = '[object Int32Array]',
                    uint8Tag = '[object Uint8Array]',
                    uint8ClampedTag = '[object Uint8ClampedArray]',
                    uint16Tag = '[object Uint16Array]',
                    uint32Tag = '[object Uint32Array]';

                /** Used to match empty string literals in compiled template source. */
                var reEmptyStringLeading = /\b__p \+= '';/g,
                    reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
                    reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;

                /** Used to match HTML entities and HTML characters. */
                var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
                    reUnescapedHtml = /[&<>"']/g,
                    reHasEscapedHtml = RegExp(reEscapedHtml.source),
                    reHasUnescapedHtml = RegExp(reUnescapedHtml.source);

                /** Used to match template delimiters. */
                var reEscape = /<%-([\s\S]+?)%>/g,
                    reEvaluate = /<%([\s\S]+?)%>/g,
                    reInterpolate = /<%=([\s\S]+?)%>/g;

                /** Used to match property names within property paths. */
                var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
                    reIsPlainProp = /^\w*$/,
                    reLeadingDot = /^\./,
                    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;

                /**
                 * Used to match `RegExp`
                 * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
                 */
                var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
                    reHasRegExpChar = RegExp(reRegExpChar.source);

                /** Used to match leading and trailing whitespace. */
                var reTrim = /^\s+|\s+$/g,
                    reTrimStart = /^\s+/,
                    reTrimEnd = /\s+$/;

                /** Used to match wrap detail comments. */
                var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
                    reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
                    reSplitDetails = /,? & /;

                /** Used to match words composed of alphanumeric characters. */
                var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;

                /** Used to match backslashes in property paths. */
                var reEscapeChar = /\\(\\)?/g;

                /**
                 * Used to match
                 * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
                 */
                var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;

                /** Used to match `RegExp` flags from their coerced string values. */
                var reFlags = /\w*$/;

                /** Used to detect bad signed hexadecimal string values. */
                var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;

                /** Used to detect binary string values. */
                var reIsBinary = /^0b[01]+$/i;

                /** Used to detect host constructors (Safari). */
                var reIsHostCtor = /^\[object .+?Constructor\]$/;

                /** Used to detect octal string values. */
                var reIsOctal = /^0o[0-7]+$/i;

                /** Used to detect unsigned integer values. */
                var reIsUint = /^(?:0|[1-9]\d*)$/;

                /** Used to match Latin Unicode letters (excluding mathematical operators). */
                var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;

                /** Used to ensure capturing order of template delimiters. */
                var reNoMatch = /($^)/;

                /** Used to match unescaped characters in compiled string literals. */
                var reUnescapedString = /['\n\r\u2028\u2029\\]/g;

                /** Used to compose unicode character classes. */
                var rsAstralRange = '\\ud800-\\udfff',
                    rsComboMarksRange = '\\u0300-\\u036f',
                    reComboHalfMarksRange = '\\ufe20-\\ufe2f',
                    rsComboSymbolsRange = '\\u20d0-\\u20ff',
                    rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
                    rsDingbatRange = '\\u2700-\\u27bf',
                    rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
                    rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
                    rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
                    rsPunctuationRange = '\\u2000-\\u206f',
                    rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
                    rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
                    rsVarRange = '\\ufe0e\\ufe0f',
                    rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;

                /** Used to compose unicode capture groups. */
                var rsApos = "['\u2019]",
                    rsAstral = '[' + rsAstralRange + ']',
                    rsBreak = '[' + rsBreakRange + ']',
                    rsCombo = '[' + rsComboRange + ']',
                    rsDigits = '\\d+',
                    rsDingbat = '[' + rsDingbatRange + ']',
                    rsLower = '[' + rsLowerRange + ']',
                    rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
                    rsFitz = '\\ud83c[\\udffb-\\udfff]',
                    rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
                    rsNonAstral = '[^' + rsAstralRange + ']',
                    rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
                    rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
                    rsUpper = '[' + rsUpperRange + ']',
                    rsZWJ = '\\u200d';

                /** Used to compose unicode regexes. */
                var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
                    rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
                    rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
                    rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
                    reOptMod = rsModifier + '?',
                    rsOptVar = '[' + rsVarRange + ']?',
                    rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
                    rsOrdLower = '\\d*(?:(?:1st|2nd|3rd|(?![123])\\dth)\\b)',
                    rsOrdUpper = '\\d*(?:(?:1ST|2ND|3RD|(?![123])\\dTH)\\b)',
                    rsSeq = rsOptVar + reOptMod + rsOptJoin,
                    rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
                    rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';

                /** Used to match apostrophes. */
                var reApos = RegExp(rsApos, 'g');

                /**
                 * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
                 * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
                 */
                var reComboMark = RegExp(rsCombo, 'g');

                /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
                var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');

                /** Used to match complex or compound words. */
                var reUnicodeWord = RegExp([
                    rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
                    rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
                    rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
                    rsUpper + '+' + rsOptContrUpper,
                    rsOrdUpper,
                    rsOrdLower,
                    rsDigits,
                    rsEmoji
                ].join('|'), 'g');

                /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
                var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + ']');

                /** Used to detect strings that need a more robust regexp to match words. */
                var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;

                /** Used to assign default `context` object properties. */
                var contextProps = [
                    'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
                    'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
                    'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
                    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
                    '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
                ];

                /** Used to make template sourceURLs easier to identify. */
                var templateCounter = -1;

                /** Used to identify `toStringTag` values of typed arrays. */
                var typedArrayTags = {};
                typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
                    typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
                        typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
                            typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
                                typedArrayTags[uint32Tag] = true;
                typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
                    typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
                        typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
                            typedArrayTags[errorTag] = typedArrayTags[funcTag] =
                                typedArrayTags[mapTag] = typedArrayTags[numberTag] =
                                    typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
                                        typedArrayTags[setTag] = typedArrayTags[stringTag] =
                                            typedArrayTags[weakMapTag] = false;

                /** Used to identify `toStringTag` values supported by `_.clone`. */
                var cloneableTags = {};
                cloneableTags[argsTag] = cloneableTags[arrayTag] =
                    cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
                        cloneableTags[boolTag] = cloneableTags[dateTag] =
                            cloneableTags[float32Tag] = cloneableTags[float64Tag] =
                                cloneableTags[int8Tag] = cloneableTags[int16Tag] =
                                    cloneableTags[int32Tag] = cloneableTags[mapTag] =
                                        cloneableTags[numberTag] = cloneableTags[objectTag] =
                                            cloneableTags[regexpTag] = cloneableTags[setTag] =
                                                cloneableTags[stringTag] = cloneableTags[symbolTag] =
                                                    cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
                                                        cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
                cloneableTags[errorTag] = cloneableTags[funcTag] =
                    cloneableTags[weakMapTag] = false;

                /** Used to map Latin Unicode letters to basic Latin letters. */
                var deburredLetters = {
                    // Latin-1 Supplement block.
                    '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
                    '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
                    '\xc7': 'C',  '\xe7': 'c',
                    '\xd0': 'D',  '\xf0': 'd',
                    '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
                    '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
                    '\xcc': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
                    '\xec': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
                    '\xd1': 'N',  '\xf1': 'n',
                    '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
                    '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
                    '\xd9': 'U',  '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
                    '\xf9': 'u',  '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
                    '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
                    '\xc6': 'Ae', '\xe6': 'ae',
                    '\xde': 'Th', '\xfe': 'th',
                    '\xdf': 'ss',
                    // Latin Extended-A block.
                    '\u0100': 'A',  '\u0102': 'A', '\u0104': 'A',
                    '\u0101': 'a',  '\u0103': 'a', '\u0105': 'a',
                    '\u0106': 'C',  '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
                    '\u0107': 'c',  '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
                    '\u010e': 'D',  '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
                    '\u0112': 'E',  '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
                    '\u0113': 'e',  '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
                    '\u011c': 'G',  '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
                    '\u011d': 'g',  '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
                    '\u0124': 'H',  '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
                    '\u0128': 'I',  '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
                    '\u0129': 'i',  '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
                    '\u0134': 'J',  '\u0135': 'j',
                    '\u0136': 'K',  '\u0137': 'k', '\u0138': 'k',
                    '\u0139': 'L',  '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
                    '\u013a': 'l',  '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
                    '\u0143': 'N',  '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
                    '\u0144': 'n',  '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
                    '\u014c': 'O',  '\u014e': 'O', '\u0150': 'O',
                    '\u014d': 'o',  '\u014f': 'o', '\u0151': 'o',
                    '\u0154': 'R',  '\u0156': 'R', '\u0158': 'R',
                    '\u0155': 'r',  '\u0157': 'r', '\u0159': 'r',
                    '\u015a': 'S',  '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
                    '\u015b': 's',  '\u015d': 's', '\u015f': 's', '\u0161': 's',
                    '\u0162': 'T',  '\u0164': 'T', '\u0166': 'T',
                    '\u0163': 't',  '\u0165': 't', '\u0167': 't',
                    '\u0168': 'U',  '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
                    '\u0169': 'u',  '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
                    '\u0174': 'W',  '\u0175': 'w',
                    '\u0176': 'Y',  '\u0177': 'y', '\u0178': 'Y',
                    '\u0179': 'Z',  '\u017b': 'Z', '\u017d': 'Z',
                    '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
                    '\u0132': 'IJ', '\u0133': 'ij',
                    '\u0152': 'Oe', '\u0153': 'oe',
                    '\u0149': "'n", '\u017f': 's'
                };

                /** Used to map characters to HTML entities. */
                var htmlEscapes = {
                    '&': '&amp;',
                    '<': '&lt;',
                    '>': '&gt;',
                    '"': '&quot;',
                    "'": '&#39;'
                };

                /** Used to map HTML entities to characters. */
                var htmlUnescapes = {
                    '&amp;': '&',
                    '&lt;': '<',
                    '&gt;': '>',
                    '&quot;': '"',
                    '&#39;': "'"
                };

                /** Used to escape characters for inclusion in compiled string literals. */
                var stringEscapes = {
                    '\\': '\\',
                    "'": "'",
                    '\n': 'n',
                    '\r': 'r',
                    '\u2028': 'u2028',
                    '\u2029': 'u2029'
                };

                /** Built-in method references without a dependency on `root`. */
                var freeParseFloat = parseFloat,
                    freeParseInt = parseInt;

                /** Detect free variable `global` from Node.js. */
                var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;

                /** Detect free variable `self`. */
                var freeSelf = typeof self == 'object' && self && self.Object === Object && self;

                /** Used as a reference to the global object. */
                var root = freeGlobal || freeSelf || Function('return this')();

                /** Detect free variable `exports`. */
                var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;

                /** Detect free variable `module`. */
                var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;

                /** Detect the popular CommonJS extension `module.exports`. */
                var moduleExports = freeModule && freeModule.exports === freeExports;

                /** Detect free variable `process` from Node.js. */
                var freeProcess = moduleExports && freeGlobal.process;

                /** Used to access faster Node.js helpers. */
                var nodeUtil = (function() {
                    try {
                        return freeProcess && freeProcess.binding && freeProcess.binding('util');
                    } catch (e) {}
                }());

                /* Node.js helper references. */
                var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
                    nodeIsDate = nodeUtil && nodeUtil.isDate,
                    nodeIsMap = nodeUtil && nodeUtil.isMap,
                    nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
                    nodeIsSet = nodeUtil && nodeUtil.isSet,
                    nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;

                /*--------------------------------------------------------------------------*/

                /**
                 * Adds the key-value `pair` to `map`.
                 *
                 * @private
                 * @param {Object} map The map to modify.
                 * @param {Array} pair The key-value pair to add.
                 * @returns {Object} Returns `map`.
                 */
                function addMapEntry(map, pair) {
                    // Don't return `map.set` because it's not chainable in IE 11.
                    map.set(pair[0], pair[1]);
                    return map;
                }

                /**
                 * Adds `value` to `set`.
                 *
                 * @private
                 * @param {Object} set The set to modify.
                 * @param {*} value The value to add.
                 * @returns {Object} Returns `set`.
                 */
                function addSetEntry(set, value) {
                    // Don't return `set.add` because it's not chainable in IE 11.
                    set.add(value);
                    return set;
                }

                /**
                 * A faster alternative to `Function#apply`, this function invokes `func`
                 * with the `this` binding of `thisArg` and the arguments of `args`.
                 *
                 * @private
                 * @param {Function} func The function to invoke.
                 * @param {*} thisArg The `this` binding of `func`.
                 * @param {Array} args The arguments to invoke `func` with.
                 * @returns {*} Returns the result of `func`.
                 */
                function apply(func, thisArg, args) {
                    switch (args.length) {
                        case 0: return func.call(thisArg);
                        case 1: return func.call(thisArg, args[0]);
                        case 2: return func.call(thisArg, args[0], args[1]);
                        case 3: return func.call(thisArg, args[0], args[1], args[2]);
                    }
                    return func.apply(thisArg, args);
                }

                /**
                 * A specialized version of `baseAggregator` for arrays.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} setter The function to set `accumulator` values.
                 * @param {Function} iteratee The iteratee to transform keys.
                 * @param {Object} accumulator The initial aggregated object.
                 * @returns {Function} Returns `accumulator`.
                 */
                function arrayAggregator(array, setter, iteratee, accumulator) {
                    var index = -1,
                        length = array == null ? 0 : array.length;

                    while (++index < length) {
                        var value = array[index];
                        setter(accumulator, value, iteratee(value), array);
                    }
                    return accumulator;
                }

                /**
                 * A specialized version of `_.forEach` for arrays without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @returns {Array} Returns `array`.
                 */
                function arrayEach(array, iteratee) {
                    var index = -1,
                        length = array == null ? 0 : array.length;

                    while (++index < length) {
                        if (iteratee(array[index], index, array) === false) {
                            break;
                        }
                    }
                    return array;
                }

                /**
                 * A specialized version of `_.forEachRight` for arrays without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @returns {Array} Returns `array`.
                 */
                function arrayEachRight(array, iteratee) {
                    var length = array == null ? 0 : array.length;

                    while (length--) {
                        if (iteratee(array[length], length, array) === false) {
                            break;
                        }
                    }
                    return array;
                }

                /**
                 * A specialized version of `_.every` for arrays without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} predicate The function invoked per iteration.
                 * @returns {boolean} Returns `true` if all elements pass the predicate check,
                 *  else `false`.
                 */
                function arrayEvery(array, predicate) {
                    var index = -1,
                        length = array == null ? 0 : array.length;

                    while (++index < length) {
                        if (!predicate(array[index], index, array)) {
                            return false;
                        }
                    }
                    return true;
                }

                /**
                 * A specialized version of `_.filter` for arrays without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} predicate The function invoked per iteration.
                 * @returns {Array} Returns the new filtered array.
                 */
                function arrayFilter(array, predicate) {
                    var index = -1,
                        length = array == null ? 0 : array.length,
                        resIndex = 0,
                        result = [];

                    while (++index < length) {
                        var value = array[index];
                        if (predicate(value, index, array)) {
                            result[resIndex++] = value;
                        }
                    }
                    return result;
                }

                /**
                 * A specialized version of `_.includes` for arrays without support for
                 * specifying an index to search from.
                 *
                 * @private
                 * @param {Array} [array] The array to inspect.
                 * @param {*} target The value to search for.
                 * @returns {boolean} Returns `true` if `target` is found, else `false`.
                 */
                function arrayIncludes(array, value) {
                    var length = array == null ? 0 : array.length;
                    return !!length && baseIndexOf(array, value, 0) > -1;
                }

                /**
                 * This function is like `arrayIncludes` except that it accepts a comparator.
                 *
                 * @private
                 * @param {Array} [array] The array to inspect.
                 * @param {*} target The value to search for.
                 * @param {Function} comparator The comparator invoked per element.
                 * @returns {boolean} Returns `true` if `target` is found, else `false`.
                 */
                function arrayIncludesWith(array, value, comparator) {
                    var index = -1,
                        length = array == null ? 0 : array.length;

                    while (++index < length) {
                        if (comparator(value, array[index])) {
                            return true;
                        }
                    }
                    return false;
                }

                /**
                 * A specialized version of `_.map` for arrays without support for iteratee
                 * shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @returns {Array} Returns the new mapped array.
                 */
                function arrayMap(array, iteratee) {
                    var index = -1,
                        length = array == null ? 0 : array.length,
                        result = Array(length);

                    while (++index < length) {
                        result[index] = iteratee(array[index], index, array);
                    }
                    return result;
                }

                /**
                 * Appends the elements of `values` to `array`.
                 *
                 * @private
                 * @param {Array} array The array to modify.
                 * @param {Array} values The values to append.
                 * @returns {Array} Returns `array`.
                 */
                function arrayPush(array, values) {
                    var index = -1,
                        length = values.length,
                        offset = array.length;

                    while (++index < length) {
                        array[offset + index] = values[index];
                    }
                    return array;
                }

                /**
                 * A specialized version of `_.reduce` for arrays without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @param {*} [accumulator] The initial value.
                 * @param {boolean} [initAccum] Specify using the first element of `array` as
                 *  the initial value.
                 * @returns {*} Returns the accumulated value.
                 */
                function arrayReduce(array, iteratee, accumulator, initAccum) {
                    var index = -1,
                        length = array == null ? 0 : array.length;

                    if (initAccum && length) {
                        accumulator = array[++index];
                    }
                    while (++index < length) {
                        accumulator = iteratee(accumulator, array[index], index, array);
                    }
                    return accumulator;
                }

                /**
                 * A specialized version of `_.reduceRight` for arrays without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @param {*} [accumulator] The initial value.
                 * @param {boolean} [initAccum] Specify using the last element of `array` as
                 *  the initial value.
                 * @returns {*} Returns the accumulated value.
                 */
                function arrayReduceRight(array, iteratee, accumulator, initAccum) {
                    var length = array == null ? 0 : array.length;
                    if (initAccum && length) {
                        accumulator = array[--length];
                    }
                    while (length--) {
                        accumulator = iteratee(accumulator, array[length], length, array);
                    }
                    return accumulator;
                }

                /**
                 * A specialized version of `_.some` for arrays without support for iteratee
                 * shorthands.
                 *
                 * @private
                 * @param {Array} [array] The array to iterate over.
                 * @param {Function} predicate The function invoked per iteration.
                 * @returns {boolean} Returns `true` if any element passes the predicate check,
                 *  else `false`.
                 */
                function arraySome(array, predicate) {
                    var index = -1,
                        length = array == null ? 0 : array.length;

                    while (++index < length) {
                        if (predicate(array[index], index, array)) {
                            return true;
                        }
                    }
                    return false;
                }

                /**
                 * Gets the size of an ASCII `string`.
                 *
                 * @private
                 * @param {string} string The string inspect.
                 * @returns {number} Returns the string size.
                 */
                var asciiSize = baseProperty('length');

                /**
                 * Converts an ASCII `string` to an array.
                 *
                 * @private
                 * @param {string} string The string to convert.
                 * @returns {Array} Returns the converted array.
                 */
                function asciiToArray(string) {
                    return string.split('');
                }

                /**
                 * Splits an ASCII `string` into an array of its words.
                 *
                 * @private
                 * @param {string} The string to inspect.
                 * @returns {Array} Returns the words of `string`.
                 */
                function asciiWords(string) {
                    return string.match(reAsciiWord) || [];
                }

                /**
                 * The base implementation of methods like `_.findKey` and `_.findLastKey`,
                 * without support for iteratee shorthands, which iterates over `collection`
                 * using `eachFunc`.
                 *
                 * @private
                 * @param {Array|Object} collection The collection to inspect.
                 * @param {Function} predicate The function invoked per iteration.
                 * @param {Function} eachFunc The function to iterate over `collection`.
                 * @returns {*} Returns the found element or its key, else `undefined`.
                 */
                function baseFindKey(collection, predicate, eachFunc) {
                    var result;
                    eachFunc(collection, function(value, key, collection) {
                        if (predicate(value, key, collection)) {
                            result = key;
                            return false;
                        }
                    });
                    return result;
                }

                /**
                 * The base implementation of `_.findIndex` and `_.findLastIndex` without
                 * support for iteratee shorthands.
                 *
                 * @private
                 * @param {Array} array The array to inspect.
                 * @param {Function} predicate The function invoked per iteration.
                 * @param {number} fromIndex The index to search from.
                 * @param {boolean} [fromRight] Specify iterating from right to left.
                 * @returns {number} Returns the index of the matched value, else `-1`.
                 */
                function baseFindIndex(array, predicate, fromIndex, fromRight) {
                    var length = array.length,
                        index = fromIndex + (fromRight ? 1 : -1);

                    while ((fromRight ? index-- : ++index < length)) {
                        if (predicate(array[index], index, array)) {
                            return index;
                        }
                    }
                    return -1;
                }

                /**
                 * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
                 *
                 * @private
                 * @param {Array} array The array to inspect.
                 * @param {*} value The value to search for.
                 * @param {number} fromIndex The index to search from.
                 * @returns {number} Returns the index of the matched value, else `-1`.
                 */
                function baseIndexOf(array, value, fromIndex) {
                    return value === value
                        ? strictIndexOf(array, value, fromIndex)
                        : baseFindIndex(array, baseIsNaN, fromIndex);
                }

                /**
                 * This function is like `baseIndexOf` except that it accepts a comparator.
                 *
                 * @private
                 * @param {Array} array The array to inspect.
                 * @param {*} value The value to search for.
                 * @param {number} fromIndex The index to search from.
                 * @param {Function} comparator The comparator invoked per element.
                 * @returns {number} Returns the index of the matched value, else `-1`.
                 */
                function baseIndexOfWith(array, value, fromIndex, comparator) {
                    var index = fromIndex - 1,
                        length = array.length;

                    while (++index < length) {
                        if (comparator(array[index], value)) {
                            return index;
                        }
                    }
                    return -1;
                }

                /**
                 * The base implementation of `_.isNaN` without support for number objects.
                 *
                 * @private
                 * @param {*} value The value to check.
                 * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
                 */
                function baseIsNaN(value) {
                    return value !== value;
                }

                /**
                 * The base implementation of `_.mean` and `_.meanBy` without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} array The array to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @returns {number} Returns the mean.
                 */
                function baseMean(array, iteratee) {
                    var length = array == null ? 0 : array.length;
                    return length ? (baseSum(array, iteratee) / length) : NAN;
                }

                /**
                 * The base implementation of `_.property` without support for deep paths.
                 *
                 * @private
                 * @param {string} key The key of the property to get.
                 * @returns {Function} Returns the new accessor function.
                 */
                function baseProperty(key) {
                    return function(object) {
                        return object == null ? undefined : object[key];
                    };
                }

                /**
                 * The base implementation of `_.propertyOf` without support for deep paths.
                 *
                 * @private
                 * @param {Object} object The object to query.
                 * @returns {Function} Returns the new accessor function.
                 */
                function basePropertyOf(object) {
                    return function(key) {
                        return object == null ? undefined : object[key];
                    };
                }

                /**
                 * The base implementation of `_.reduce` and `_.reduceRight`, without support
                 * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
                 *
                 * @private
                 * @param {Array|Object} collection The collection to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @param {*} accumulator The initial value.
                 * @param {boolean} initAccum Specify using the first or last element of
                 *  `collection` as the initial value.
                 * @param {Function} eachFunc The function to iterate over `collection`.
                 * @returns {*} Returns the accumulated value.
                 */
                function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
                    eachFunc(collection, function(value, index, collection) {
                        accumulator = initAccum
                            ? (initAccum = false, value)
                            : iteratee(accumulator, value, index, collection);
                    });
                    return accumulator;
                }

                /**
                 * The base implementation of `_.sortBy` which uses `comparer` to define the
                 * sort order of `array` and replaces criteria objects with their corresponding
                 * values.
                 *
                 * @private
                 * @param {Array} array The array to sort.
                 * @param {Function} comparer The function to define sort order.
                 * @returns {Array} Returns `array`.
                 */
                function baseSortBy(array, comparer) {
                    var length = array.length;

                    array.sort(comparer);
                    while (length--) {
                        array[length] = array[length].value;
                    }
                    return array;
                }

                /**
                 * The base implementation of `_.sum` and `_.sumBy` without support for
                 * iteratee shorthands.
                 *
                 * @private
                 * @param {Array} array The array to iterate over.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @returns {number} Returns the sum.
                 */
                function baseSum(array, iteratee) {
                    var result,
                        index = -1,
                        length = array.length;

                    while (++index < length) {
                        var current = iteratee(array[index]);
                        if (current !== undefined) {
                            result = result === undefined ? current : (result + current);
                        }
                    }
                    return result;
                }

                /**
                 * The base implementation of `_.times` without support for iteratee shorthands
                 * or max array length checks.
                 *
                 * @private
                 * @param {number} n The number of times to invoke `iteratee`.
                 * @param {Function} iteratee The function invoked per iteration.
                 * @returns {Array} Returns the array of results.
                 */
                function baseTimes(n, iteratee) {
                    var index = -1,
                        result = Array(n);

                    while (++index < n) {
                        result[index] = iteratee(index);
                    }
                    return result;
                }

                /**
                 * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
                 * of key-value pairs for `object` corresponding to the property names of `props`.
                 *
                 * @private
                 * @param {Object} object The object to query.
                 * @param {Array} props The property names to get values for.
                 * @returns {Object} Returns the key-value pairs.
                 */
                function baseToPairs(object, props) {
                    return arrayMap(props, function(key) {
                        return [key, object[key]];
                    });
                }

                /**
                 * The base implementation of `_.unary` without support for storing metadata.
                 *
                 * @private
                 * @param {Function} func The function to cap arguments for.
                 * @returns {Function} Returns the new capped function.
                 */
                function baseUnary(func) {
                    return function(value) {
                        return func(value);
                    };
                }

                /**
                 * The base implementation of `_.values` and `_.valuesIn` which creates an
                 * array of `object` property values corresponding to the property names
                 * of `props`.
                 *
                 * @private
                 * @param {Object} object The object to query.
                 * @param {Array} props The property names to get values for.
                 * @returns {Object} Returns the array of property values.
                 */
                function baseValues(object, props) {
                    return arrayMap(props, function(key) {
                        return object[key];
                    });
                }

                /**
                 * Checks if a `cache` value for `key` exists.
                 *
                 * @private
                 * @param {Object} cache The cache to query.
                 * @param {string} key The key of the entry to check.
                 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
                 */
                function cacheHas(cache, key) {
                    return cache.has(key);
                }

                /**
                 * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
                 * that is not found in the character symbols.
                 *
                 * @private
                 * @param {Array} strSymbols The string symbols to inspect.
                 * @param {Array} chrSymbols The character symbols to find.
                 * @returns {number} Returns the index of the first unmatched string symbol.
                 */
                function charsStartIndex(strSymbols, chrSymbols) {
                    var index = -1,
                        length = strSymbols.length;

                    while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
                    return index;
                }

                /**
                 * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
                 * that is not found in the character symbols.
                 *
                 * @private
                 * @param {Array} strSymbols The string symbols to inspect.
                 * @param {Array} chrSymbols The character symbols to find.
                 * @returns {number} Returns the index of the last unmatched string symbol.
                 */
                function charsEndIndex(strSymbols, chrSymbols) {
                    var index = strSymbols.length;

                    while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
                    return index;
                }

                /**
                 * Gets the number of `placeholder` occurrences in `array`.
                 *
                 * @private
                 * @param {Array} array The array to inspect.
                 * @param {*} placeholder The placeholder to search for.
                 * @returns {number} Returns the placeholder count.
                 */
                function countHolders(array, placeholder) {
                    var length = array.length,
                        result = 0;

                    while (length--) {
                        if (array[length] === placeholder) {
                            ++result;
                        }
                    }
                    return result;
                }

                /**
                 * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
                 * letters to basic Latin letters.
                 *
                 * @private
                 * @param {string} letter The matched letter to deburr.
                 * @returns {string} Returns the deburred letter.
                 */
                var deburrLetter = basePropertyOf(deburredLetters);

                /**
                 * Used by `_.escape` to convert characters to HTML entities.
                 *
                 * @private
                 * @param {string} chr The matched character to escape.
                 * @returns {string} Returns the escaped character.
                 */
                var escapeHtmlChar = basePropertyOf(htmlEscapes);

                /**
                 * Used by `_.template` to escape characters for inclusion in compiled string literals.
                 *
                 * @private
                 * @param {string} chr The matched character to escape.
                 * @returns {string} Returns the escaped character.
                 */
                function escapeStringChar(chr) {
                    return '\\' + stringEscapes[chr];
                }

                /**
                 * Gets the value at `key` of `object`.
                 *
                 * @private
                 * @param {Object} [object] The object to query.
                 * @param {string} key The key of the property to get.
                 * @returns {*} Returns the property value.
                 */
                function getValue(object, key) {
                    return object == null ? undefined : object[key];
                }

                /**
                 * Checks if `string` contains Unicode symbols.
                 *
                 * @private
                 * @param {string} string The string to inspect.
                 * @returns {boolean} Returns `true` if a symbol is found, else `false`.
                 */
                function hasUnicode(string) {
                    return reHasUnicode.test(string);
                }

                /**
                 * Checks if `string` contains a word composed of Unicode symbols.
                 *
                 * @private
                 * @param {string} string The string to inspect.
                 * @returns {boolean} Returns `true` if a word is found, else `false`.
                 */
                function hasUnicodeWord(string) {
                    return reHasUnicodeWord.test(string);
                }

                /**
                 * Converts `iterator` to an array.
                 *
                 * @private
                 * @param {Object} iterator The iterator to convert.
                 * @returns {Array} Returns the converted array.
                 */
                function iteratorToArray(iterator) {
                    var data,
                        result = [];

                    while (!(data = iterator.next()).done) {
                        result.push(data.value);
                    }
                    return result;
                }

                /**
                 * Converts `map` to its key-value pairs.
                 *
                 * @private
                 * @param {Object} map The map to convert.
                 * @returns {Array} Returns the key-value pairs.
                 */
                function mapToArray(map) {
                    var index = -1,
                        result = Array(map.size);

                    map.forEach(function(value, key) {
                        result[++index] = [key, value];
                    });
                    return result;
                }

                /**
                 * Creates a unary function that invokes `func` with its argument transformed.
                 *
                 * @private
                 * @param {Function} func The function to wrap.
                 * @param {Function} transform The argument transform.
                 * @returns {Function} Returns the new function.
                 */
                function overArg(func, transform) {
                    return function(arg) {
                        return func(transform(arg));
                    };
                }

                /**
                 * Replaces all `placeholder` elements in `array` with an internal placeholder
                 * and returns an array of their indexes.
                 *
                 * @private
                 * @param {Array} array The array to modify.
                 * @param {*} placeholder The placeholder to replace.
                 * @returns {Array} Returns the new array of placeholder indexes.
                 */
                function replaceHolders(array, placeholder) {
                    var index = -1,
                        length = array.length,
                        resIndex = 0,
                        result = [];

                    while (++index < length) {
                        var value = array[index];
                        if (value === placeholder || value === PLACEHOLDER) {
                            array[index] = PLACEHOLDER;
                            result[resIndex++] = index;
                        }
                    }
                    return result;
                }

                /**
                 * Converts `set` to an array of its values.
                 *
                 * @private
                 * @param {Object} set The set to convert.
                 * @returns {Array} Returns the values.
                 */
                function setToArray(set) {
                    var index = -1,
                        result = Array(set.size);

                    set.forEach(function(value) {
                        result[++index] = value;
                    });
                    return result;
                }

                /**
                 * Converts `set` to its value-value pairs.
                 *
                 * @private
                 * @param {Object} set The set to convert.
                 * @returns {Array} Returns the value-value pairs.
                 */
                function setToPairs(set) {
                    var index = -1,
                        result = Array(set.size);

                    set.forEach(function(value) {
                        result[++index] = [value, value];
                    });
                    return result;
                }

                /**
                 * A specialized version of `_.indexOf` which performs strict equality
                 * comparisons of values, i.e. `===`.
                 *
                 * @private
                 * @param {Array} array The array to inspect.
                 * @param {*} value The value to search for.
                 * @param {number} fromIndex The index to search from.
                 * @returns {number} Returns the index of the matched value, else `-1`.
                 */
                function strictIndexOf(array, value, fromIndex) {
                    var index = fromIndex - 1,
                        length = array.length;

                    while (++index < length) {
                        if (array[index] === value) {
                            return index;
                        }
                    }
                    return -1;
                }

                /**
                 * A specialized version of `_.lastIndexOf` which performs strict equality
                 * comparisons of values, i.e. `===`.
                 *
                 * @private
                 * @param {Array} array The array to inspect.
                 * @param {*} value The value to search for.
                 * @param {number} fromIndex The index to search from.
                 * @returns {number} Returns the index of the matched value, else `-1`.
                 */
                function strictLastIndexOf(array, value, fromIndex) {
                    var index = fromIndex + 1;
                    while (index--) {
                        if (array[index] === value) {
                            return index;
                        }
                    }
                    return index;
                }

                /**
                 * Gets the number of symbols in `string`.
                 *
                 * @private
                 * @param {string} string The string to inspect.
                 * @returns {number} Returns the string size.
                 */
                function stringSize(string) {
                    return hasUnicode(string)
                        ? unicodeSize(string)
                        : asciiSize(string);
                }

                /**
                 * Converts `string` to an array.
                 *
                 * @private
                 * @param {string} string The string to convert.
                 * @returns {Array} Returns the converted array.
                 */
                function stringToArray(string) {
                    return hasUnicode(string)
                        ? unicodeToArray(string)
                        : asciiToArray(string);
                }

                /**
                 * Used by `_.unescape` to convert HTML entities to characters.
                 *
                 * @private
                 * @param {string} chr The matched character to unescape.
                 * @returns {string} Returns the unescaped character.
                 */
                var unescapeHtmlChar = basePropertyOf(htmlUnescapes);

                /**
                 * Gets the size of a Unicode `string`.
                 *
                 * @private
                 * @param {string} string The string inspect.
                 * @returns {number} Returns the string size.
                 */
                function unicodeSize(string) {
                    var result = reUnicode.lastIndex = 0;
                    while (reUnicode.test(string)) {
                        ++result;
                    }
                    return result;
                }

                /**
                 * Converts a Unicode `string` to an array.
                 *
                 * @private
                 * @param {string} string The string to convert.
                 * @returns {Array} Returns the converted array.
                 */
                function unicodeToArray(string) {
                    return string.match(reUnicode) || [];
                }

                /**
                 * Splits a Unicode `string` into an array of its words.
                 *
                 * @private
                 * @param {string} The string to inspect.
                 * @returns {Array} Returns the words of `string`.
                 */
                function unicodeWords(string) {
                    return string.match(reUnicodeWord) || [];
                }

                /*--------------------------------------------------------------------------*/

                /**
                 * Create a new pristine `lodash` function using the `context` object.
                 *
                 * @static
                 * @memberOf _
                 * @since 1.1.0
                 * @category Util
                 * @param {Object} [context=root] The context object.
                 * @returns {Function} Returns a new `lodash` function.
                 * @example
                 *
                 * _.mixin({ 'foo': _.constant('foo') });
                 *
                 * var lodash = _.runInContext();
                 * lodash.mixin({ 'bar': lodash.constant('bar') });
                 *
                 * _.isFunction(_.foo);
                 * // => true
                 * _.isFunction(_.bar);
                 * // => false
                 *
                 * lodash.isFunction(lodash.foo);
                 * // => false
                 * lodash.isFunction(lodash.bar);
                 * // => true
                 *
                 * // Create a suped-up `defer` in Node.js.
                 * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
                 */
                var runInContext = (function runInContext(context) {
                    context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));

                    /** Built-in constructor references. */
                    var Array = context.Array,
                        Date = context.Date,
                        Error = context.Error,
                        Function = context.Function,
                        Math = context.Math,
                        Object = context.Object,
                        RegExp = context.RegExp,
                        String = context.String,
                        TypeError = context.TypeError;

                    /** Used for built-in method references. */
                    var arrayProto = Array.prototype,
                        funcProto = Function.prototype,
                        objectProto = Object.prototype;

                    /** Used to detect overreaching core-js shims. */
                    var coreJsData = context['__core-js_shared__'];

                    /** Used to resolve the decompiled source of functions. */
                    var funcToString = funcProto.toString;

                    /** Used to check objects for own properties. */
                    var hasOwnProperty = objectProto.hasOwnProperty;

                    /** Used to generate unique IDs. */
                    var idCounter = 0;

                    /** Used to detect methods masquerading as native. */
                    var maskSrcKey = (function() {
                        var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
                        return uid ? ('Symbol(src)_1.' + uid) : '';
                    }());

                    /**
                     * Used to resolve the
                     * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
                     * of values.
                     */
                    var nativeObjectToString = objectProto.toString;

                    /** Used to infer the `Object` constructor. */
                    var objectCtorString = funcToString.call(Object);

                    /** Used to restore the original `_` reference in `_.noConflict`. */
                    var oldDash = root._;

                    /** Used to detect if a method is native. */
                    var reIsNative = RegExp('^' +
                        funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
                            .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
                    );

                    /** Built-in value references. */
                    var Buffer = moduleExports ? context.Buffer : undefined,
                        Symbol = context.Symbol,
                        Uint8Array = context.Uint8Array,
                        allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
                        getPrototype = overArg(Object.getPrototypeOf, Object),
                        objectCreate = Object.create,
                        propertyIsEnumerable = objectProto.propertyIsEnumerable,
                        splice = arrayProto.splice,
                        spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
                        symIterator = Symbol ? Symbol.iterator : undefined,
                        symToStringTag = Symbol ? Symbol.toStringTag : undefined;

                    var defineProperty = (function() {
                        try {
                            var func = getNative(Object, 'defineProperty');
                            func({}, '', {});
                            return func;
                        } catch (e) {}
                    }());

                    /** Mocked built-ins. */
                    var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
                        ctxNow = Date && Date.now !== root.Date.now && Date.now,
                        ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;

                    /* Built-in method references for those with the same name as other `lodash` methods. */
                    var nativeCeil = Math.ceil,
                        nativeFloor = Math.floor,
                        nativeGetSymbols = Object.getOwnPropertySymbols,
                        nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
                        nativeIsFinite = context.isFinite,
                        nativeJoin = arrayProto.join,
                        nativeKeys = overArg(Object.keys, Object),
                        nativeMax = Math.max,
                        nativeMin = Math.min,
                        nativeNow = Date.now,
                        nativeParseInt = context.parseInt,
                        nativeRandom = Math.random,
                        nativeReverse = arrayProto.reverse;

                    /* Built-in method references that are verified to be native. */
                    var DataView = getNative(context, 'DataView'),
                        Map = getNative(context, 'Map'),
                        Promise = getNative(context, 'Promise'),
                        Set = getNative(context, 'Set'),
                        WeakMap = getNative(context, 'WeakMap'),
                        nativeCreate = getNative(Object, 'create');

                    /** Used to store function metadata. */
                    var metaMap = WeakMap && new WeakMap;

                    /** Used to lookup unminified function names. */
                    var realNames = {};

                    /** Used to detect maps, sets, and weakmaps. */
                    var dataViewCtorString = toSource(DataView),
                        mapCtorString = toSource(Map),
                        promiseCtorString = toSource(Promise),
                        setCtorString = toSource(Set),
                        weakMapCtorString = toSource(WeakMap);

                    /** Used to convert symbols to primitives and strings. */
                    var symbolProto = Symbol ? Symbol.prototype : undefined,
                        symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
                        symbolToString = symbolProto ? symbolProto.toString : undefined;

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates a `lodash` object which wraps `value` to enable implicit method
                     * chain sequences. Methods that operate on and return arrays, collections,
                     * and functions can be chained together. Methods that retrieve a single value
                     * or may return a primitive value will automatically end the chain sequence
                     * and return the unwrapped value. Otherwise, the value must be unwrapped
                     * with `_#value`.
                     *
                     * Explicit chain sequences, which must be unwrapped with `_#value`, may be
                     * enabled using `_.chain`.
                     *
                     * The execution of chained methods is lazy, that is, it's deferred until
                     * `_#value` is implicitly or explicitly called.
                     *
                     * Lazy evaluation allows several methods to support shortcut fusion.
                     * Shortcut fusion is an optimization to merge iteratee calls; this avoids
                     * the creation of intermediate arrays and can greatly reduce the number of
                     * iteratee executions. Sections of a chain sequence qualify for shortcut
                     * fusion if the section is applied to an array and iteratees accept only
                     * one argument. The heuristic for whether a section qualifies for shortcut
                     * fusion is subject to change.
                     *
                     * Chaining is supported in custom builds as long as the `_#value` method is
                     * directly or indirectly included in the build.
                     *
                     * In addition to lodash methods, wrappers have `Array` and `String` methods.
                     *
                     * The wrapper `Array` methods are:
                     * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
                     *
                     * The wrapper `String` methods are:
                     * `replace` and `split`
                     *
                     * The wrapper methods that support shortcut fusion are:
                     * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
                     * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
                     * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
                     *
                     * The chainable wrapper methods are:
                     * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
                     * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
                     * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
                     * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
                     * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
                     * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
                     * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
                     * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
                     * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
                     * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
                     * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
                     * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
                     * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
                     * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
                     * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
                     * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
                     * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
                     * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
                     * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
                     * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
                     * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
                     * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
                     * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
                     * `zipObject`, `zipObjectDeep`, and `zipWith`
                     *
                     * The wrapper methods that are **not** chainable by default are:
                     * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
                     * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
                     * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
                     * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
                     * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
                     * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
                     * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
                     * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
                     * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
                     * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
                     * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
                     * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
                     * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
                     * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
                     * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
                     * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
                     * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
                     * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
                     * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
                     * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
                     * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
                     * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
                     * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
                     * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
                     * `upperFirst`, `value`, and `words`
                     *
                     * @name _
                     * @constructor
                     * @category Seq
                     * @param {*} value The value to wrap in a `lodash` instance.
                     * @returns {Object} Returns the new `lodash` wrapper instance.
                     * @example
                     *
                     * function square(n) {
     *   return n * n;
     * }
                     *
                     * var wrapped = _([1, 2, 3]);
                     *
                     * // Returns an unwrapped value.
                     * wrapped.reduce(_.add);
                     * // => 6
                     *
                     * // Returns a wrapped value.
                     * var squares = wrapped.map(square);
                     *
                     * _.isArray(squares);
                     * // => false
                     *
                     * _.isArray(squares.value());
                     * // => true
                     */
                    function lodash(value) {
                        if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
                            if (value instanceof LodashWrapper) {
                                return value;
                            }
                            if (hasOwnProperty.call(value, '__wrapped__')) {
                                return wrapperClone(value);
                            }
                        }
                        return new LodashWrapper(value);
                    }

                    /**
                     * The base implementation of `_.create` without support for assigning
                     * properties to the created object.
                     *
                     * @private
                     * @param {Object} proto The object to inherit from.
                     * @returns {Object} Returns the new object.
                     */
                    var baseCreate = (function() {
                        function object() {}
                        return function(proto) {
                            if (!isObject(proto)) {
                                return {};
                            }
                            if (objectCreate) {
                                return objectCreate(proto);
                            }
                            object.prototype = proto;
                            var result = new object;
                            object.prototype = undefined;
                            return result;
                        };
                    }());

                    /**
                     * The function whose prototype chain sequence wrappers inherit from.
                     *
                     * @private
                     */
                    function baseLodash() {
                        // No operation performed.
                    }

                    /**
                     * The base constructor for creating `lodash` wrapper objects.
                     *
                     * @private
                     * @param {*} value The value to wrap.
                     * @param {boolean} [chainAll] Enable explicit method chain sequences.
                     */
                    function LodashWrapper(value, chainAll) {
                        this.__wrapped__ = value;
                        this.__actions__ = [];
                        this.__chain__ = !!chainAll;
                        this.__index__ = 0;
                        this.__values__ = undefined;
                    }

                    /**
                     * By default, the template delimiters used by lodash are like those in
                     * embedded Ruby (ERB) as well as ES2015 template strings. Change the
                     * following template settings to use alternative delimiters.
                     *
                     * @static
                     * @memberOf _
                     * @type {Object}
                     */
                    lodash.templateSettings = {

                        /**
                         * Used to detect `data` property values to be HTML-escaped.
                         *
                         * @memberOf _.templateSettings
                         * @type {RegExp}
                         */
                        'escape': reEscape,

                        /**
                         * Used to detect code to be evaluated.
                         *
                         * @memberOf _.templateSettings
                         * @type {RegExp}
                         */
                        'evaluate': reEvaluate,

                        /**
                         * Used to detect `data` property values to inject.
                         *
                         * @memberOf _.templateSettings
                         * @type {RegExp}
                         */
                        'interpolate': reInterpolate,

                        /**
                         * Used to reference the data object in the template text.
                         *
                         * @memberOf _.templateSettings
                         * @type {string}
                         */
                        'variable': '',

                        /**
                         * Used to import variables into the compiled template.
                         *
                         * @memberOf _.templateSettings
                         * @type {Object}
                         */
                        'imports': {

                            /**
                             * A reference to the `lodash` function.
                             *
                             * @memberOf _.templateSettings.imports
                             * @type {Function}
                             */
                            '_': lodash
                        }
                    };

                    // Ensure wrappers are instances of `baseLodash`.
                    lodash.prototype = baseLodash.prototype;
                    lodash.prototype.constructor = lodash;

                    LodashWrapper.prototype = baseCreate(baseLodash.prototype);
                    LodashWrapper.prototype.constructor = LodashWrapper;

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
                     *
                     * @private
                     * @constructor
                     * @param {*} value The value to wrap.
                     */
                    function LazyWrapper(value) {
                        this.__wrapped__ = value;
                        this.__actions__ = [];
                        this.__dir__ = 1;
                        this.__filtered__ = false;
                        this.__iteratees__ = [];
                        this.__takeCount__ = MAX_ARRAY_LENGTH;
                        this.__views__ = [];
                    }

                    /**
                     * Creates a clone of the lazy wrapper object.
                     *
                     * @private
                     * @name clone
                     * @memberOf LazyWrapper
                     * @returns {Object} Returns the cloned `LazyWrapper` object.
                     */
                    function lazyClone() {
                        var result = new LazyWrapper(this.__wrapped__);
                        result.__actions__ = copyArray(this.__actions__);
                        result.__dir__ = this.__dir__;
                        result.__filtered__ = this.__filtered__;
                        result.__iteratees__ = copyArray(this.__iteratees__);
                        result.__takeCount__ = this.__takeCount__;
                        result.__views__ = copyArray(this.__views__);
                        return result;
                    }

                    /**
                     * Reverses the direction of lazy iteration.
                     *
                     * @private
                     * @name reverse
                     * @memberOf LazyWrapper
                     * @returns {Object} Returns the new reversed `LazyWrapper` object.
                     */
                    function lazyReverse() {
                        if (this.__filtered__) {
                            var result = new LazyWrapper(this);
                            result.__dir__ = -1;
                            result.__filtered__ = true;
                        } else {
                            result = this.clone();
                            result.__dir__ *= -1;
                        }
                        return result;
                    }

                    /**
                     * Extracts the unwrapped value from its lazy wrapper.
                     *
                     * @private
                     * @name value
                     * @memberOf LazyWrapper
                     * @returns {*} Returns the unwrapped value.
                     */
                    function lazyValue() {
                        var array = this.__wrapped__.value(),
                            dir = this.__dir__,
                            isArr = isArray(array),
                            isRight = dir < 0,
                            arrLength = isArr ? array.length : 0,
                            view = getView(0, arrLength, this.__views__),
                            start = view.start,
                            end = view.end,
                            length = end - start,
                            index = isRight ? end : (start - 1),
                            iteratees = this.__iteratees__,
                            iterLength = iteratees.length,
                            resIndex = 0,
                            takeCount = nativeMin(length, this.__takeCount__);

                        if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
                            return baseWrapperValue(array, this.__actions__);
                        }
                        var result = [];

                        outer:
                            while (length-- && resIndex < takeCount) {
                                index += dir;

                                var iterIndex = -1,
                                    value = array[index];

                                while (++iterIndex < iterLength) {
                                    var data = iteratees[iterIndex],
                                        iteratee = data.iteratee,
                                        type = data.type,
                                        computed = iteratee(value);

                                    if (type == LAZY_MAP_FLAG) {
                                        value = computed;
                                    } else if (!computed) {
                                        if (type == LAZY_FILTER_FLAG) {
                                            continue outer;
                                        } else {
                                            break outer;
                                        }
                                    }
                                }
                                result[resIndex++] = value;
                            }
                        return result;
                    }

                    // Ensure `LazyWrapper` is an instance of `baseLodash`.
                    LazyWrapper.prototype = baseCreate(baseLodash.prototype);
                    LazyWrapper.prototype.constructor = LazyWrapper;

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates a hash object.
                     *
                     * @private
                     * @constructor
                     * @param {Array} [entries] The key-value pairs to cache.
                     */
                    function Hash(entries) {
                        var index = -1,
                            length = entries == null ? 0 : entries.length;

                        this.clear();
                        while (++index < length) {
                            var entry = entries[index];
                            this.set(entry[0], entry[1]);
                        }
                    }

                    /**
                     * Removes all key-value entries from the hash.
                     *
                     * @private
                     * @name clear
                     * @memberOf Hash
                     */
                    function hashClear() {
                        this.__data__ = nativeCreate ? nativeCreate(null) : {};
                        this.size = 0;
                    }

                    /**
                     * Removes `key` and its value from the hash.
                     *
                     * @private
                     * @name delete
                     * @memberOf Hash
                     * @param {Object} hash The hash to modify.
                     * @param {string} key The key of the value to remove.
                     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
                     */
                    function hashDelete(key) {
                        var result = this.has(key) && delete this.__data__[key];
                        this.size -= result ? 1 : 0;
                        return result;
                    }

                    /**
                     * Gets the hash value for `key`.
                     *
                     * @private
                     * @name get
                     * @memberOf Hash
                     * @param {string} key The key of the value to get.
                     * @returns {*} Returns the entry value.
                     */
                    function hashGet(key) {
                        var data = this.__data__;
                        if (nativeCreate) {
                            var result = data[key];
                            return result === HASH_UNDEFINED ? undefined : result;
                        }
                        return hasOwnProperty.call(data, key) ? data[key] : undefined;
                    }

                    /**
                     * Checks if a hash value for `key` exists.
                     *
                     * @private
                     * @name has
                     * @memberOf Hash
                     * @param {string} key The key of the entry to check.
                     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
                     */
                    function hashHas(key) {
                        var data = this.__data__;
                        return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
                    }

                    /**
                     * Sets the hash `key` to `value`.
                     *
                     * @private
                     * @name set
                     * @memberOf Hash
                     * @param {string} key The key of the value to set.
                     * @param {*} value The value to set.
                     * @returns {Object} Returns the hash instance.
                     */
                    function hashSet(key, value) {
                        var data = this.__data__;
                        this.size += this.has(key) ? 0 : 1;
                        data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
                        return this;
                    }

                    // Add methods to `Hash`.
                    Hash.prototype.clear = hashClear;
                    Hash.prototype['delete'] = hashDelete;
                    Hash.prototype.get = hashGet;
                    Hash.prototype.has = hashHas;
                    Hash.prototype.set = hashSet;

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates an list cache object.
                     *
                     * @private
                     * @constructor
                     * @param {Array} [entries] The key-value pairs to cache.
                     */
                    function ListCache(entries) {
                        var index = -1,
                            length = entries == null ? 0 : entries.length;

                        this.clear();
                        while (++index < length) {
                            var entry = entries[index];
                            this.set(entry[0], entry[1]);
                        }
                    }

                    /**
                     * Removes all key-value entries from the list cache.
                     *
                     * @private
                     * @name clear
                     * @memberOf ListCache
                     */
                    function listCacheClear() {
                        this.__data__ = [];
                        this.size = 0;
                    }

                    /**
                     * Removes `key` and its value from the list cache.
                     *
                     * @private
                     * @name delete
                     * @memberOf ListCache
                     * @param {string} key The key of the value to remove.
                     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
                     */
                    function listCacheDelete(key) {
                        var data = this.__data__,
                            index = assocIndexOf(data, key);

                        if (index < 0) {
                            return false;
                        }
                        var lastIndex = data.length - 1;
                        if (index == lastIndex) {
                            data.pop();
                        } else {
                            splice.call(data, index, 1);
                        }
                        --this.size;
                        return true;
                    }

                    /**
                     * Gets the list cache value for `key`.
                     *
                     * @private
                     * @name get
                     * @memberOf ListCache
                     * @param {string} key The key of the value to get.
                     * @returns {*} Returns the entry value.
                     */
                    function listCacheGet(key) {
                        var data = this.__data__,
                            index = assocIndexOf(data, key);

                        return index < 0 ? undefined : data[index][1];
                    }

                    /**
                     * Checks if a list cache value for `key` exists.
                     *
                     * @private
                     * @name has
                     * @memberOf ListCache
                     * @param {string} key The key of the entry to check.
                     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
                     */
                    function listCacheHas(key) {
                        return assocIndexOf(this.__data__, key) > -1;
                    }

                    /**
                     * Sets the list cache `key` to `value`.
                     *
                     * @private
                     * @name set
                     * @memberOf ListCache
                     * @param {string} key The key of the value to set.
                     * @param {*} value The value to set.
                     * @returns {Object} Returns the list cache instance.
                     */
                    function listCacheSet(key, value) {
                        var data = this.__data__,
                            index = assocIndexOf(data, key);

                        if (index < 0) {
                            ++this.size;
                            data.push([key, value]);
                        } else {
                            data[index][1] = value;
                        }
                        return this;
                    }

                    // Add methods to `ListCache`.
                    ListCache.prototype.clear = listCacheClear;
                    ListCache.prototype['delete'] = listCacheDelete;
                    ListCache.prototype.get = listCacheGet;
                    ListCache.prototype.has = listCacheHas;
                    ListCache.prototype.set = listCacheSet;

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates a map cache object to store key-value pairs.
                     *
                     * @private
                     * @constructor
                     * @param {Array} [entries] The key-value pairs to cache.
                     */
                    function MapCache(entries) {
                        var index = -1,
                            length = entries == null ? 0 : entries.length;

                        this.clear();
                        while (++index < length) {
                            var entry = entries[index];
                            this.set(entry[0], entry[1]);
                        }
                    }

                    /**
                     * Removes all key-value entries from the map.
                     *
                     * @private
                     * @name clear
                     * @memberOf MapCache
                     */
                    function mapCacheClear() {
                        this.size = 0;
                        this.__data__ = {
                            'hash': new Hash,
                            'map': new (Map || ListCache),
                            'string': new Hash
                        };
                    }

                    /**
                     * Removes `key` and its value from the map.
                     *
                     * @private
                     * @name delete
                     * @memberOf MapCache
                     * @param {string} key The key of the value to remove.
                     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
                     */
                    function mapCacheDelete(key) {
                        var result = getMapData(this, key)['delete'](key);
                        this.size -= result ? 1 : 0;
                        return result;
                    }

                    /**
                     * Gets the map value for `key`.
                     *
                     * @private
                     * @name get
                     * @memberOf MapCache
                     * @param {string} key The key of the value to get.
                     * @returns {*} Returns the entry value.
                     */
                    function mapCacheGet(key) {
                        return getMapData(this, key).get(key);
                    }

                    /**
                     * Checks if a map value for `key` exists.
                     *
                     * @private
                     * @name has
                     * @memberOf MapCache
                     * @param {string} key The key of the entry to check.
                     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
                     */
                    function mapCacheHas(key) {
                        return getMapData(this, key).has(key);
                    }

                    /**
                     * Sets the map `key` to `value`.
                     *
                     * @private
                     * @name set
                     * @memberOf MapCache
                     * @param {string} key The key of the value to set.
                     * @param {*} value The value to set.
                     * @returns {Object} Returns the map cache instance.
                     */
                    function mapCacheSet(key, value) {
                        var data = getMapData(this, key),
                            size = data.size;

                        data.set(key, value);
                        this.size += data.size == size ? 0 : 1;
                        return this;
                    }

                    // Add methods to `MapCache`.
                    MapCache.prototype.clear = mapCacheClear;
                    MapCache.prototype['delete'] = mapCacheDelete;
                    MapCache.prototype.get = mapCacheGet;
                    MapCache.prototype.has = mapCacheHas;
                    MapCache.prototype.set = mapCacheSet;

                    /*------------------------------------------------------------------------*/

                    /**
                     *
                     * Creates an array cache object to store unique values.
                     *
                     * @private
                     * @constructor
                     * @param {Array} [values] The values to cache.
                     */
                    function SetCache(values) {
                        var index = -1,
                            length = values == null ? 0 : values.length;

                        this.__data__ = new MapCache;
                        while (++index < length) {
                            this.add(values[index]);
                        }
                    }

                    /**
                     * Adds `value` to the array cache.
                     *
                     * @private
                     * @name add
                     * @memberOf SetCache
                     * @alias push
                     * @param {*} value The value to cache.
                     * @returns {Object} Returns the cache instance.
                     */
                    function setCacheAdd(value) {
                        this.__data__.set(value, HASH_UNDEFINED);
                        return this;
                    }

                    /**
                     * Checks if `value` is in the array cache.
                     *
                     * @private
                     * @name has
                     * @memberOf SetCache
                     * @param {*} value The value to search for.
                     * @returns {number} Returns `true` if `value` is found, else `false`.
                     */
                    function setCacheHas(value) {
                        return this.__data__.has(value);
                    }

                    // Add methods to `SetCache`.
                    SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
                    SetCache.prototype.has = setCacheHas;

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates a stack cache object to store key-value pairs.
                     *
                     * @private
                     * @constructor
                     * @param {Array} [entries] The key-value pairs to cache.
                     */
                    function Stack(entries) {
                        var data = this.__data__ = new ListCache(entries);
                        this.size = data.size;
                    }

                    /**
                     * Removes all key-value entries from the stack.
                     *
                     * @private
                     * @name clear
                     * @memberOf Stack
                     */
                    function stackClear() {
                        this.__data__ = new ListCache;
                        this.size = 0;
                    }

                    /**
                     * Removes `key` and its value from the stack.
                     *
                     * @private
                     * @name delete
                     * @memberOf Stack
                     * @param {string} key The key of the value to remove.
                     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
                     */
                    function stackDelete(key) {
                        var data = this.__data__,
                            result = data['delete'](key);

                        this.size = data.size;
                        return result;
                    }

                    /**
                     * Gets the stack value for `key`.
                     *
                     * @private
                     * @name get
                     * @memberOf Stack
                     * @param {string} key The key of the value to get.
                     * @returns {*} Returns the entry value.
                     */
                    function stackGet(key) {
                        return this.__data__.get(key);
                    }

                    /**
                     * Checks if a stack value for `key` exists.
                     *
                     * @private
                     * @name has
                     * @memberOf Stack
                     * @param {string} key The key of the entry to check.
                     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
                     */
                    function stackHas(key) {
                        return this.__data__.has(key);
                    }

                    /**
                     * Sets the stack `key` to `value`.
                     *
                     * @private
                     * @name set
                     * @memberOf Stack
                     * @param {string} key The key of the value to set.
                     * @param {*} value The value to set.
                     * @returns {Object} Returns the stack cache instance.
                     */
                    function stackSet(key, value) {
                        var data = this.__data__;
                        if (data instanceof ListCache) {
                            var pairs = data.__data__;
                            if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
                                pairs.push([key, value]);
                                this.size = ++data.size;
                                return this;
                            }
                            data = this.__data__ = new MapCache(pairs);
                        }
                        data.set(key, value);
                        this.size = data.size;
                        return this;
                    }

                    // Add methods to `Stack`.
                    Stack.prototype.clear = stackClear;
                    Stack.prototype['delete'] = stackDelete;
                    Stack.prototype.get = stackGet;
                    Stack.prototype.has = stackHas;
                    Stack.prototype.set = stackSet;

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates an array of the enumerable property names of the array-like `value`.
                     *
                     * @private
                     * @param {*} value The value to query.
                     * @param {boolean} inherited Specify returning inherited property names.
                     * @returns {Array} Returns the array of property names.
                     */
                    function arrayLikeKeys(value, inherited) {
                        var isArr = isArray(value),
                            isArg = !isArr && isArguments(value),
                            isBuff = !isArr && !isArg && isBuffer(value),
                            isType = !isArr && !isArg && !isBuff && isTypedArray(value),
                            skipIndexes = isArr || isArg || isBuff || isType,
                            result = skipIndexes ? baseTimes(value.length, String) : [],
                            length = result.length;

                        for (var key in value) {
                            if ((inherited || hasOwnProperty.call(value, key)) &&
                                !(skipIndexes && (
                                    // Safari 9 has enumerable `arguments.length` in strict mode.
                                    key == 'length' ||
                                    // Node.js 0.10 has enumerable non-index properties on buffers.
                                    (isBuff && (key == 'offset' || key == 'parent')) ||
                                    // PhantomJS 2 has enumerable non-index properties on typed arrays.
                                    (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
                                    // Skip index properties.
                                    isIndex(key, length)
                                ))) {
                                result.push(key);
                            }
                        }
                        return result;
                    }

                    /**
                     * A specialized version of `_.sample` for arrays.
                     *
                     * @private
                     * @param {Array} array The array to sample.
                     * @returns {*} Returns the random element.
                     */
                    function arraySample(array) {
                        var length = array.length;
                        return length ? array[baseRandom(0, length - 1)] : undefined;
                    }

                    /**
                     * A specialized version of `_.sampleSize` for arrays.
                     *
                     * @private
                     * @param {Array} array The array to sample.
                     * @param {number} n The number of elements to sample.
                     * @returns {Array} Returns the random elements.
                     */
                    function arraySampleSize(array, n) {
                        return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
                    }

                    /**
                     * A specialized version of `_.shuffle` for arrays.
                     *
                     * @private
                     * @param {Array} array The array to shuffle.
                     * @returns {Array} Returns the new shuffled array.
                     */
                    function arrayShuffle(array) {
                        return shuffleSelf(copyArray(array));
                    }

                    /**
                     * This function is like `assignValue` except that it doesn't assign
                     * `undefined` values.
                     *
                     * @private
                     * @param {Object} object The object to modify.
                     * @param {string} key The key of the property to assign.
                     * @param {*} value The value to assign.
                     */
                    function assignMergeValue(object, key, value) {
                        if ((value !== undefined && !eq(object[key], value)) ||
                            (value === undefined && !(key in object))) {
                            baseAssignValue(object, key, value);
                        }
                    }

                    /**
                     * Assigns `value` to `key` of `object` if the existing value is not equivalent
                     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons.
                     *
                     * @private
                     * @param {Object} object The object to modify.
                     * @param {string} key The key of the property to assign.
                     * @param {*} value The value to assign.
                     */
                    function assignValue(object, key, value) {
                        var objValue = object[key];
                        if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
                            (value === undefined && !(key in object))) {
                            baseAssignValue(object, key, value);
                        }
                    }

                    /**
                     * Gets the index at which the `key` is found in `array` of key-value pairs.
                     *
                     * @private
                     * @param {Array} array The array to inspect.
                     * @param {*} key The key to search for.
                     * @returns {number} Returns the index of the matched value, else `-1`.
                     */
                    function assocIndexOf(array, key) {
                        var length = array.length;
                        while (length--) {
                            if (eq(array[length][0], key)) {
                                return length;
                            }
                        }
                        return -1;
                    }

                    /**
                     * Aggregates elements of `collection` on `accumulator` with keys transformed
                     * by `iteratee` and values set by `setter`.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} setter The function to set `accumulator` values.
                     * @param {Function} iteratee The iteratee to transform keys.
                     * @param {Object} accumulator The initial aggregated object.
                     * @returns {Function} Returns `accumulator`.
                     */
                    function baseAggregator(collection, setter, iteratee, accumulator) {
                        baseEach(collection, function(value, key, collection) {
                            setter(accumulator, value, iteratee(value), collection);
                        });
                        return accumulator;
                    }

                    /**
                     * The base implementation of `_.assign` without support for multiple sources
                     * or `customizer` functions.
                     *
                     * @private
                     * @param {Object} object The destination object.
                     * @param {Object} source The source object.
                     * @returns {Object} Returns `object`.
                     */
                    function baseAssign(object, source) {
                        return object && copyObject(source, keys(source), object);
                    }

                    /**
                     * The base implementation of `_.assignIn` without support for multiple sources
                     * or `customizer` functions.
                     *
                     * @private
                     * @param {Object} object The destination object.
                     * @param {Object} source The source object.
                     * @returns {Object} Returns `object`.
                     */
                    function baseAssignIn(object, source) {
                        return object && copyObject(source, keysIn(source), object);
                    }

                    /**
                     * The base implementation of `assignValue` and `assignMergeValue` without
                     * value checks.
                     *
                     * @private
                     * @param {Object} object The object to modify.
                     * @param {string} key The key of the property to assign.
                     * @param {*} value The value to assign.
                     */
                    function baseAssignValue(object, key, value) {
                        if (key == '__proto__' && defineProperty) {
                            defineProperty(object, key, {
                                'configurable': true,
                                'enumerable': true,
                                'value': value,
                                'writable': true
                            });
                        } else {
                            object[key] = value;
                        }
                    }

                    /**
                     * The base implementation of `_.at` without support for individual paths.
                     *
                     * @private
                     * @param {Object} object The object to iterate over.
                     * @param {string[]} paths The property paths to pick.
                     * @returns {Array} Returns the picked elements.
                     */
                    function baseAt(object, paths) {
                        var index = -1,
                            length = paths.length,
                            result = Array(length),
                            skip = object == null;

                        while (++index < length) {
                            result[index] = skip ? undefined : get(object, paths[index]);
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `_.clamp` which doesn't coerce arguments.
                     *
                     * @private
                     * @param {number} number The number to clamp.
                     * @param {number} [lower] The lower bound.
                     * @param {number} upper The upper bound.
                     * @returns {number} Returns the clamped number.
                     */
                    function baseClamp(number, lower, upper) {
                        if (number === number) {
                            if (upper !== undefined) {
                                number = number <= upper ? number : upper;
                            }
                            if (lower !== undefined) {
                                number = number >= lower ? number : lower;
                            }
                        }
                        return number;
                    }

                    /**
                     * The base implementation of `_.clone` and `_.cloneDeep` which tracks
                     * traversed objects.
                     *
                     * @private
                     * @param {*} value The value to clone.
                     * @param {boolean} bitmask The bitmask flags.
                     *  1 - Deep clone
                     *  2 - Flatten inherited properties
                     *  4 - Clone symbols
                     * @param {Function} [customizer] The function to customize cloning.
                     * @param {string} [key] The key of `value`.
                     * @param {Object} [object] The parent object of `value`.
                     * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
                     * @returns {*} Returns the cloned value.
                     */
                    function baseClone(value, bitmask, customizer, key, object, stack) {
                        var result,
                            isDeep = bitmask & CLONE_DEEP_FLAG,
                            isFlat = bitmask & CLONE_FLAT_FLAG,
                            isFull = bitmask & CLONE_SYMBOLS_FLAG;

                        if (customizer) {
                            result = object ? customizer(value, key, object, stack) : customizer(value);
                        }
                        if (result !== undefined) {
                            return result;
                        }
                        if (!isObject(value)) {
                            return value;
                        }
                        var isArr = isArray(value);
                        if (isArr) {
                            result = initCloneArray(value);
                            if (!isDeep) {
                                return copyArray(value, result);
                            }
                        } else {
                            var tag = getTag(value),
                                isFunc = tag == funcTag || tag == genTag;

                            if (isBuffer(value)) {
                                return cloneBuffer(value, isDeep);
                            }
                            if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
                                result = (isFlat || isFunc) ? {} : initCloneObject(value);
                                if (!isDeep) {
                                    return isFlat
                                        ? copySymbolsIn(value, baseAssignIn(result, value))
                                        : copySymbols(value, baseAssign(result, value));
                                }
                            } else {
                                if (!cloneableTags[tag]) {
                                    return object ? value : {};
                                }
                                result = initCloneByTag(value, tag, baseClone, isDeep);
                            }
                        }
                        // Check for circular references and return its corresponding clone.
                        stack || (stack = new Stack);
                        var stacked = stack.get(value);
                        if (stacked) {
                            return stacked;
                        }
                        stack.set(value, result);

                        var keysFunc = isFull
                            ? (isFlat ? getAllKeysIn : getAllKeys)
                            : (isFlat ? keysIn : keys);

                        var props = isArr ? undefined : keysFunc(value);
                        arrayEach(props || value, function(subValue, key) {
                            if (props) {
                                key = subValue;
                                subValue = value[key];
                            }
                            // Recursively populate clone (susceptible to call stack limits).
                            assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
                        });
                        return result;
                    }

                    /**
                     * The base implementation of `_.conforms` which doesn't clone `source`.
                     *
                     * @private
                     * @param {Object} source The object of property predicates to conform to.
                     * @returns {Function} Returns the new spec function.
                     */
                    function baseConforms(source) {
                        var props = keys(source);
                        return function(object) {
                            return baseConformsTo(object, source, props);
                        };
                    }

                    /**
                     * The base implementation of `_.conformsTo` which accepts `props` to check.
                     *
                     * @private
                     * @param {Object} object The object to inspect.
                     * @param {Object} source The object of property predicates to conform to.
                     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
                     */
                    function baseConformsTo(object, source, props) {
                        var length = props.length;
                        if (object == null) {
                            return !length;
                        }
                        object = Object(object);
                        while (length--) {
                            var key = props[length],
                                predicate = source[key],
                                value = object[key];

                            if ((value === undefined && !(key in object)) || !predicate(value)) {
                                return false;
                            }
                        }
                        return true;
                    }

                    /**
                     * The base implementation of `_.delay` and `_.defer` which accepts `args`
                     * to provide to `func`.
                     *
                     * @private
                     * @param {Function} func The function to delay.
                     * @param {number} wait The number of milliseconds to delay invocation.
                     * @param {Array} args The arguments to provide to `func`.
                     * @returns {number|Object} Returns the timer id or timeout object.
                     */
                    function baseDelay(func, wait, args) {
                        if (typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        return setTimeout(function() { func.apply(undefined, args); }, wait);
                    }

                    /**
                     * The base implementation of methods like `_.difference` without support
                     * for excluding multiple arrays or iteratee shorthands.
                     *
                     * @private
                     * @param {Array} array The array to inspect.
                     * @param {Array} values The values to exclude.
                     * @param {Function} [iteratee] The iteratee invoked per element.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new array of filtered values.
                     */
                    function baseDifference(array, values, iteratee, comparator) {
                        var index = -1,
                            includes = arrayIncludes,
                            isCommon = true,
                            length = array.length,
                            result = [],
                            valuesLength = values.length;

                        if (!length) {
                            return result;
                        }
                        if (iteratee) {
                            values = arrayMap(values, baseUnary(iteratee));
                        }
                        if (comparator) {
                            includes = arrayIncludesWith;
                            isCommon = false;
                        }
                        else if (values.length >= LARGE_ARRAY_SIZE) {
                            includes = cacheHas;
                            isCommon = false;
                            values = new SetCache(values);
                        }
                        outer:
                            while (++index < length) {
                                var value = array[index],
                                    computed = iteratee == null ? value : iteratee(value);

                                value = (comparator || value !== 0) ? value : 0;
                                if (isCommon && computed === computed) {
                                    var valuesIndex = valuesLength;
                                    while (valuesIndex--) {
                                        if (values[valuesIndex] === computed) {
                                            continue outer;
                                        }
                                    }
                                    result.push(value);
                                }
                                else if (!includes(values, computed, comparator)) {
                                    result.push(value);
                                }
                            }
                        return result;
                    }

                    /**
                     * The base implementation of `_.forEach` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} iteratee The function invoked per iteration.
                     * @returns {Array|Object} Returns `collection`.
                     */
                    var baseEach = createBaseEach(baseForOwn);

                    /**
                     * The base implementation of `_.forEachRight` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} iteratee The function invoked per iteration.
                     * @returns {Array|Object} Returns `collection`.
                     */
                    var baseEachRight = createBaseEach(baseForOwnRight, true);

                    /**
                     * The base implementation of `_.every` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} predicate The function invoked per iteration.
                     * @returns {boolean} Returns `true` if all elements pass the predicate check,
                     *  else `false`
                     */
                    function baseEvery(collection, predicate) {
                        var result = true;
                        baseEach(collection, function(value, index, collection) {
                            result = !!predicate(value, index, collection);
                            return result;
                        });
                        return result;
                    }

                    /**
                     * The base implementation of methods like `_.max` and `_.min` which accepts a
                     * `comparator` to determine the extremum value.
                     *
                     * @private
                     * @param {Array} array The array to iterate over.
                     * @param {Function} iteratee The iteratee invoked per iteration.
                     * @param {Function} comparator The comparator used to compare values.
                     * @returns {*} Returns the extremum value.
                     */
                    function baseExtremum(array, iteratee, comparator) {
                        var index = -1,
                            length = array.length;

                        while (++index < length) {
                            var value = array[index],
                                current = iteratee(value);

                            if (current != null && (computed === undefined
                                        ? (current === current && !isSymbol(current))
                                        : comparator(current, computed)
                                )) {
                                var computed = current,
                                    result = value;
                            }
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `_.fill` without an iteratee call guard.
                     *
                     * @private
                     * @param {Array} array The array to fill.
                     * @param {*} value The value to fill `array` with.
                     * @param {number} [start=0] The start position.
                     * @param {number} [end=array.length] The end position.
                     * @returns {Array} Returns `array`.
                     */
                    function baseFill(array, value, start, end) {
                        var length = array.length;

                        start = toInteger(start);
                        if (start < 0) {
                            start = -start > length ? 0 : (length + start);
                        }
                        end = (end === undefined || end > length) ? length : toInteger(end);
                        if (end < 0) {
                            end += length;
                        }
                        end = start > end ? 0 : toLength(end);
                        while (start < end) {
                            array[start++] = value;
                        }
                        return array;
                    }

                    /**
                     * The base implementation of `_.filter` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} predicate The function invoked per iteration.
                     * @returns {Array} Returns the new filtered array.
                     */
                    function baseFilter(collection, predicate) {
                        var result = [];
                        baseEach(collection, function(value, index, collection) {
                            if (predicate(value, index, collection)) {
                                result.push(value);
                            }
                        });
                        return result;
                    }

                    /**
                     * The base implementation of `_.flatten` with support for restricting flattening.
                     *
                     * @private
                     * @param {Array} array The array to flatten.
                     * @param {number} depth The maximum recursion depth.
                     * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
                     * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
                     * @param {Array} [result=[]] The initial result value.
                     * @returns {Array} Returns the new flattened array.
                     */
                    function baseFlatten(array, depth, predicate, isStrict, result) {
                        var index = -1,
                            length = array.length;

                        predicate || (predicate = isFlattenable);
                        result || (result = []);

                        while (++index < length) {
                            var value = array[index];
                            if (depth > 0 && predicate(value)) {
                                if (depth > 1) {
                                    // Recursively flatten arrays (susceptible to call stack limits).
                                    baseFlatten(value, depth - 1, predicate, isStrict, result);
                                } else {
                                    arrayPush(result, value);
                                }
                            } else if (!isStrict) {
                                result[result.length] = value;
                            }
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `baseForOwn` which iterates over `object`
                     * properties returned by `keysFunc` and invokes `iteratee` for each property.
                     * Iteratee functions may exit iteration early by explicitly returning `false`.
                     *
                     * @private
                     * @param {Object} object The object to iterate over.
                     * @param {Function} iteratee The function invoked per iteration.
                     * @param {Function} keysFunc The function to get the keys of `object`.
                     * @returns {Object} Returns `object`.
                     */
                    var baseFor = createBaseFor();

                    /**
                     * This function is like `baseFor` except that it iterates over properties
                     * in the opposite order.
                     *
                     * @private
                     * @param {Object} object The object to iterate over.
                     * @param {Function} iteratee The function invoked per iteration.
                     * @param {Function} keysFunc The function to get the keys of `object`.
                     * @returns {Object} Returns `object`.
                     */
                    var baseForRight = createBaseFor(true);

                    /**
                     * The base implementation of `_.forOwn` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Object} object The object to iterate over.
                     * @param {Function} iteratee The function invoked per iteration.
                     * @returns {Object} Returns `object`.
                     */
                    function baseForOwn(object, iteratee) {
                        return object && baseFor(object, iteratee, keys);
                    }

                    /**
                     * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Object} object The object to iterate over.
                     * @param {Function} iteratee The function invoked per iteration.
                     * @returns {Object} Returns `object`.
                     */
                    function baseForOwnRight(object, iteratee) {
                        return object && baseForRight(object, iteratee, keys);
                    }

                    /**
                     * The base implementation of `_.functions` which creates an array of
                     * `object` function property names filtered from `props`.
                     *
                     * @private
                     * @param {Object} object The object to inspect.
                     * @param {Array} props The property names to filter.
                     * @returns {Array} Returns the function names.
                     */
                    function baseFunctions(object, props) {
                        return arrayFilter(props, function(key) {
                            return isFunction(object[key]);
                        });
                    }

                    /**
                     * The base implementation of `_.get` without support for default values.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path of the property to get.
                     * @returns {*} Returns the resolved value.
                     */
                    function baseGet(object, path) {
                        path = castPath(path, object);

                        var index = 0,
                            length = path.length;

                        while (object != null && index < length) {
                            object = object[toKey(path[index++])];
                        }
                        return (index && index == length) ? object : undefined;
                    }

                    /**
                     * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
                     * `keysFunc` and `symbolsFunc` to get the enumerable property names and
                     * symbols of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @param {Function} keysFunc The function to get the keys of `object`.
                     * @param {Function} symbolsFunc The function to get the symbols of `object`.
                     * @returns {Array} Returns the array of property names and symbols.
                     */
                    function baseGetAllKeys(object, keysFunc, symbolsFunc) {
                        var result = keysFunc(object);
                        return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
                    }

                    /**
                     * The base implementation of `getTag` without fallbacks for buggy environments.
                     *
                     * @private
                     * @param {*} value The value to query.
                     * @returns {string} Returns the `toStringTag`.
                     */
                    function baseGetTag(value) {
                        if (value == null) {
                            return value === undefined ? undefinedTag : nullTag;
                        }
                        return (symToStringTag && symToStringTag in Object(value))
                            ? getRawTag(value)
                            : objectToString(value);
                    }

                    /**
                     * The base implementation of `_.gt` which doesn't coerce arguments.
                     *
                     * @private
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if `value` is greater than `other`,
                     *  else `false`.
                     */
                    function baseGt(value, other) {
                        return value > other;
                    }

                    /**
                     * The base implementation of `_.has` without support for deep paths.
                     *
                     * @private
                     * @param {Object} [object] The object to query.
                     * @param {Array|string} key The key to check.
                     * @returns {boolean} Returns `true` if `key` exists, else `false`.
                     */
                    function baseHas(object, key) {
                        return object != null && hasOwnProperty.call(object, key);
                    }

                    /**
                     * The base implementation of `_.hasIn` without support for deep paths.
                     *
                     * @private
                     * @param {Object} [object] The object to query.
                     * @param {Array|string} key The key to check.
                     * @returns {boolean} Returns `true` if `key` exists, else `false`.
                     */
                    function baseHasIn(object, key) {
                        return object != null && key in Object(object);
                    }

                    /**
                     * The base implementation of `_.inRange` which doesn't coerce arguments.
                     *
                     * @private
                     * @param {number} number The number to check.
                     * @param {number} start The start of the range.
                     * @param {number} end The end of the range.
                     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
                     */
                    function baseInRange(number, start, end) {
                        return number >= nativeMin(start, end) && number < nativeMax(start, end);
                    }

                    /**
                     * The base implementation of methods like `_.intersection`, without support
                     * for iteratee shorthands, that accepts an array of arrays to inspect.
                     *
                     * @private
                     * @param {Array} arrays The arrays to inspect.
                     * @param {Function} [iteratee] The iteratee invoked per element.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new array of shared values.
                     */
                    function baseIntersection(arrays, iteratee, comparator) {
                        var includes = comparator ? arrayIncludesWith : arrayIncludes,
                            length = arrays[0].length,
                            othLength = arrays.length,
                            othIndex = othLength,
                            caches = Array(othLength),
                            maxLength = Infinity,
                            result = [];

                        while (othIndex--) {
                            var array = arrays[othIndex];
                            if (othIndex && iteratee) {
                                array = arrayMap(array, baseUnary(iteratee));
                            }
                            maxLength = nativeMin(array.length, maxLength);
                            caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
                                ? new SetCache(othIndex && array)
                                : undefined;
                        }
                        array = arrays[0];

                        var index = -1,
                            seen = caches[0];

                        outer:
                            while (++index < length && result.length < maxLength) {
                                var value = array[index],
                                    computed = iteratee ? iteratee(value) : value;

                                value = (comparator || value !== 0) ? value : 0;
                                if (!(seen
                                            ? cacheHas(seen, computed)
                                            : includes(result, computed, comparator)
                                    )) {
                                    othIndex = othLength;
                                    while (--othIndex) {
                                        var cache = caches[othIndex];
                                        if (!(cache
                                                ? cacheHas(cache, computed)
                                                : includes(arrays[othIndex], computed, comparator))
                                        ) {
                                            continue outer;
                                        }
                                    }
                                    if (seen) {
                                        seen.push(computed);
                                    }
                                    result.push(value);
                                }
                            }
                        return result;
                    }

                    /**
                     * The base implementation of `_.invert` and `_.invertBy` which inverts
                     * `object` with values transformed by `iteratee` and set by `setter`.
                     *
                     * @private
                     * @param {Object} object The object to iterate over.
                     * @param {Function} setter The function to set `accumulator` values.
                     * @param {Function} iteratee The iteratee to transform values.
                     * @param {Object} accumulator The initial inverted object.
                     * @returns {Function} Returns `accumulator`.
                     */
                    function baseInverter(object, setter, iteratee, accumulator) {
                        baseForOwn(object, function(value, key, object) {
                            setter(accumulator, iteratee(value), key, object);
                        });
                        return accumulator;
                    }

                    /**
                     * The base implementation of `_.invoke` without support for individual
                     * method arguments.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path of the method to invoke.
                     * @param {Array} args The arguments to invoke the method with.
                     * @returns {*} Returns the result of the invoked method.
                     */
                    function baseInvoke(object, path, args) {
                        path = castPath(path, object);
                        object = parent(object, path);
                        var func = object == null ? object : object[toKey(last(path))];
                        return func == null ? undefined : apply(func, object, args);
                    }

                    /**
                     * The base implementation of `_.isArguments`.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
                     */
                    function baseIsArguments(value) {
                        return isObjectLike(value) && baseGetTag(value) == argsTag;
                    }

                    /**
                     * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
                     */
                    function baseIsArrayBuffer(value) {
                        return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
                    }

                    /**
                     * The base implementation of `_.isDate` without Node.js optimizations.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
                     */
                    function baseIsDate(value) {
                        return isObjectLike(value) && baseGetTag(value) == dateTag;
                    }

                    /**
                     * The base implementation of `_.isEqual` which supports partial comparisons
                     * and tracks traversed objects.
                     *
                     * @private
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @param {boolean} bitmask The bitmask flags.
                     *  1 - Unordered comparison
                     *  2 - Partial comparison
                     * @param {Function} [customizer] The function to customize comparisons.
                     * @param {Object} [stack] Tracks traversed `value` and `other` objects.
                     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
                     */
                    function baseIsEqual(value, other, bitmask, customizer, stack) {
                        if (value === other) {
                            return true;
                        }
                        if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
                            return value !== value && other !== other;
                        }
                        return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
                    }

                    /**
                     * A specialized version of `baseIsEqual` for arrays and objects which performs
                     * deep comparisons and tracks traversed objects enabling objects with circular
                     * references to be compared.
                     *
                     * @private
                     * @param {Object} object The object to compare.
                     * @param {Object} other The other object to compare.
                     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
                     * @param {Function} customizer The function to customize comparisons.
                     * @param {Function} equalFunc The function to determine equivalents of values.
                     * @param {Object} [stack] Tracks traversed `object` and `other` objects.
                     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
                     */
                    function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
                        var objIsArr = isArray(object),
                            othIsArr = isArray(other),
                            objTag = objIsArr ? arrayTag : getTag(object),
                            othTag = othIsArr ? arrayTag : getTag(other);

                        objTag = objTag == argsTag ? objectTag : objTag;
                        othTag = othTag == argsTag ? objectTag : othTag;

                        var objIsObj = objTag == objectTag,
                            othIsObj = othTag == objectTag,
                            isSameTag = objTag == othTag;

                        if (isSameTag && isBuffer(object)) {
                            if (!isBuffer(other)) {
                                return false;
                            }
                            objIsArr = true;
                            objIsObj = false;
                        }
                        if (isSameTag && !objIsObj) {
                            stack || (stack = new Stack);
                            return (objIsArr || isTypedArray(object))
                                ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
                                : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
                        }
                        if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
                            var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
                                othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');

                            if (objIsWrapped || othIsWrapped) {
                                var objUnwrapped = objIsWrapped ? object.value() : object,
                                    othUnwrapped = othIsWrapped ? other.value() : other;

                                stack || (stack = new Stack);
                                return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
                            }
                        }
                        if (!isSameTag) {
                            return false;
                        }
                        stack || (stack = new Stack);
                        return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
                    }

                    /**
                     * The base implementation of `_.isMap` without Node.js optimizations.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
                     */
                    function baseIsMap(value) {
                        return isObjectLike(value) && getTag(value) == mapTag;
                    }

                    /**
                     * The base implementation of `_.isMatch` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Object} object The object to inspect.
                     * @param {Object} source The object of property values to match.
                     * @param {Array} matchData The property names, values, and compare flags to match.
                     * @param {Function} [customizer] The function to customize comparisons.
                     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
                     */
                    function baseIsMatch(object, source, matchData, customizer) {
                        var index = matchData.length,
                            length = index,
                            noCustomizer = !customizer;

                        if (object == null) {
                            return !length;
                        }
                        object = Object(object);
                        while (index--) {
                            var data = matchData[index];
                            if ((noCustomizer && data[2])
                                    ? data[1] !== object[data[0]]
                                    : !(data[0] in object)
                            ) {
                                return false;
                            }
                        }
                        while (++index < length) {
                            data = matchData[index];
                            var key = data[0],
                                objValue = object[key],
                                srcValue = data[1];

                            if (noCustomizer && data[2]) {
                                if (objValue === undefined && !(key in object)) {
                                    return false;
                                }
                            } else {
                                var stack = new Stack;
                                if (customizer) {
                                    var result = customizer(objValue, srcValue, key, object, source, stack);
                                }
                                if (!(result === undefined
                                            ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
                                            : result
                                    )) {
                                    return false;
                                }
                            }
                        }
                        return true;
                    }

                    /**
                     * The base implementation of `_.isNative` without bad shim checks.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a native function,
                     *  else `false`.
                     */
                    function baseIsNative(value) {
                        if (!isObject(value) || isMasked(value)) {
                            return false;
                        }
                        var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
                        return pattern.test(toSource(value));
                    }

                    /**
                     * The base implementation of `_.isRegExp` without Node.js optimizations.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
                     */
                    function baseIsRegExp(value) {
                        return isObjectLike(value) && baseGetTag(value) == regexpTag;
                    }

                    /**
                     * The base implementation of `_.isSet` without Node.js optimizations.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
                     */
                    function baseIsSet(value) {
                        return isObjectLike(value) && getTag(value) == setTag;
                    }

                    /**
                     * The base implementation of `_.isTypedArray` without Node.js optimizations.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
                     */
                    function baseIsTypedArray(value) {
                        return isObjectLike(value) &&
                            isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
                    }

                    /**
                     * The base implementation of `_.iteratee`.
                     *
                     * @private
                     * @param {*} [value=_.identity] The value to convert to an iteratee.
                     * @returns {Function} Returns the iteratee.
                     */
                    function baseIteratee(value) {
                        // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
                        // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
                        if (typeof value == 'function') {
                            return value;
                        }
                        if (value == null) {
                            return identity;
                        }
                        if (typeof value == 'object') {
                            return isArray(value)
                                ? baseMatchesProperty(value[0], value[1])
                                : baseMatches(value);
                        }
                        return property(value);
                    }

                    /**
                     * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property names.
                     */
                    function baseKeys(object) {
                        if (!isPrototype(object)) {
                            return nativeKeys(object);
                        }
                        var result = [];
                        for (var key in Object(object)) {
                            if (hasOwnProperty.call(object, key) && key != 'constructor') {
                                result.push(key);
                            }
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property names.
                     */
                    function baseKeysIn(object) {
                        if (!isObject(object)) {
                            return nativeKeysIn(object);
                        }
                        var isProto = isPrototype(object),
                            result = [];

                        for (var key in object) {
                            if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
                                result.push(key);
                            }
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `_.lt` which doesn't coerce arguments.
                     *
                     * @private
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if `value` is less than `other`,
                     *  else `false`.
                     */
                    function baseLt(value, other) {
                        return value < other;
                    }

                    /**
                     * The base implementation of `_.map` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} iteratee The function invoked per iteration.
                     * @returns {Array} Returns the new mapped array.
                     */
                    function baseMap(collection, iteratee) {
                        var index = -1,
                            result = isArrayLike(collection) ? Array(collection.length) : [];

                        baseEach(collection, function(value, key, collection) {
                            result[++index] = iteratee(value, key, collection);
                        });
                        return result;
                    }

                    /**
                     * The base implementation of `_.matches` which doesn't clone `source`.
                     *
                     * @private
                     * @param {Object} source The object of property values to match.
                     * @returns {Function} Returns the new spec function.
                     */
                    function baseMatches(source) {
                        var matchData = getMatchData(source);
                        if (matchData.length == 1 && matchData[0][2]) {
                            return matchesStrictComparable(matchData[0][0], matchData[0][1]);
                        }
                        return function(object) {
                            return object === source || baseIsMatch(object, source, matchData);
                        };
                    }

                    /**
                     * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
                     *
                     * @private
                     * @param {string} path The path of the property to get.
                     * @param {*} srcValue The value to match.
                     * @returns {Function} Returns the new spec function.
                     */
                    function baseMatchesProperty(path, srcValue) {
                        if (isKey(path) && isStrictComparable(srcValue)) {
                            return matchesStrictComparable(toKey(path), srcValue);
                        }
                        return function(object) {
                            var objValue = get(object, path);
                            return (objValue === undefined && objValue === srcValue)
                                ? hasIn(object, path)
                                : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
                        };
                    }

                    /**
                     * The base implementation of `_.merge` without support for multiple sources.
                     *
                     * @private
                     * @param {Object} object The destination object.
                     * @param {Object} source The source object.
                     * @param {number} srcIndex The index of `source`.
                     * @param {Function} [customizer] The function to customize merged values.
                     * @param {Object} [stack] Tracks traversed source values and their merged
                     *  counterparts.
                     */
                    function baseMerge(object, source, srcIndex, customizer, stack) {
                        if (object === source) {
                            return;
                        }
                        baseFor(source, function(srcValue, key) {
                            if (isObject(srcValue)) {
                                stack || (stack = new Stack);
                                baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
                            }
                            else {
                                var newValue = customizer
                                    ? customizer(object[key], srcValue, (key + ''), object, source, stack)
                                    : undefined;

                                if (newValue === undefined) {
                                    newValue = srcValue;
                                }
                                assignMergeValue(object, key, newValue);
                            }
                        }, keysIn);
                    }

                    /**
                     * A specialized version of `baseMerge` for arrays and objects which performs
                     * deep merges and tracks traversed objects enabling objects with circular
                     * references to be merged.
                     *
                     * @private
                     * @param {Object} object The destination object.
                     * @param {Object} source The source object.
                     * @param {string} key The key of the value to merge.
                     * @param {number} srcIndex The index of `source`.
                     * @param {Function} mergeFunc The function to merge values.
                     * @param {Function} [customizer] The function to customize assigned values.
                     * @param {Object} [stack] Tracks traversed source values and their merged
                     *  counterparts.
                     */
                    function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
                        var objValue = object[key],
                            srcValue = source[key],
                            stacked = stack.get(srcValue);

                        if (stacked) {
                            assignMergeValue(object, key, stacked);
                            return;
                        }
                        var newValue = customizer
                            ? customizer(objValue, srcValue, (key + ''), object, source, stack)
                            : undefined;

                        var isCommon = newValue === undefined;

                        if (isCommon) {
                            var isArr = isArray(srcValue),
                                isBuff = !isArr && isBuffer(srcValue),
                                isTyped = !isArr && !isBuff && isTypedArray(srcValue);

                            newValue = srcValue;
                            if (isArr || isBuff || isTyped) {
                                if (isArray(objValue)) {
                                    newValue = objValue;
                                }
                                else if (isArrayLikeObject(objValue)) {
                                    newValue = copyArray(objValue);
                                }
                                else if (isBuff) {
                                    isCommon = false;
                                    newValue = cloneBuffer(srcValue, true);
                                }
                                else if (isTyped) {
                                    isCommon = false;
                                    newValue = cloneTypedArray(srcValue, true);
                                }
                                else {
                                    newValue = [];
                                }
                            }
                            else if (isPlainObject(srcValue) || isArguments(srcValue)) {
                                newValue = objValue;
                                if (isArguments(objValue)) {
                                    newValue = toPlainObject(objValue);
                                }
                                else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
                                    newValue = initCloneObject(srcValue);
                                }
                            }
                            else {
                                isCommon = false;
                            }
                        }
                        if (isCommon) {
                            // Recursively merge objects and arrays (susceptible to call stack limits).
                            stack.set(srcValue, newValue);
                            mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
                            stack['delete'](srcValue);
                        }
                        assignMergeValue(object, key, newValue);
                    }

                    /**
                     * The base implementation of `_.nth` which doesn't coerce arguments.
                     *
                     * @private
                     * @param {Array} array The array to query.
                     * @param {number} n The index of the element to return.
                     * @returns {*} Returns the nth element of `array`.
                     */
                    function baseNth(array, n) {
                        var length = array.length;
                        if (!length) {
                            return;
                        }
                        n += n < 0 ? length : 0;
                        return isIndex(n, length) ? array[n] : undefined;
                    }

                    /**
                     * The base implementation of `_.orderBy` without param guards.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
                     * @param {string[]} orders The sort orders of `iteratees`.
                     * @returns {Array} Returns the new sorted array.
                     */
                    function baseOrderBy(collection, iteratees, orders) {
                        var index = -1;
                        iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(getIteratee()));

                        var result = baseMap(collection, function(value, key, collection) {
                            var criteria = arrayMap(iteratees, function(iteratee) {
                                return iteratee(value);
                            });
                            return { 'criteria': criteria, 'index': ++index, 'value': value };
                        });

                        return baseSortBy(result, function(object, other) {
                            return compareMultiple(object, other, orders);
                        });
                    }

                    /**
                     * The base implementation of `_.pick` without support for individual
                     * property identifiers.
                     *
                     * @private
                     * @param {Object} object The source object.
                     * @param {string[]} paths The property paths to pick.
                     * @returns {Object} Returns the new object.
                     */
                    function basePick(object, paths) {
                        return basePickBy(object, paths, function(value, path) {
                            return hasIn(object, path);
                        });
                    }

                    /**
                     * The base implementation of  `_.pickBy` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Object} object The source object.
                     * @param {string[]} paths The property paths to pick.
                     * @param {Function} predicate The function invoked per property.
                     * @returns {Object} Returns the new object.
                     */
                    function basePickBy(object, paths, predicate) {
                        var index = -1,
                            length = paths.length,
                            result = {};

                        while (++index < length) {
                            var path = paths[index],
                                value = baseGet(object, path);

                            if (predicate(value, path)) {
                                baseSet(result, castPath(path, object), value);
                            }
                        }
                        return result;
                    }

                    /**
                     * A specialized version of `baseProperty` which supports deep paths.
                     *
                     * @private
                     * @param {Array|string} path The path of the property to get.
                     * @returns {Function} Returns the new accessor function.
                     */
                    function basePropertyDeep(path) {
                        return function(object) {
                            return baseGet(object, path);
                        };
                    }

                    /**
                     * The base implementation of `_.pullAllBy` without support for iteratee
                     * shorthands.
                     *
                     * @private
                     * @param {Array} array The array to modify.
                     * @param {Array} values The values to remove.
                     * @param {Function} [iteratee] The iteratee invoked per element.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns `array`.
                     */
                    function basePullAll(array, values, iteratee, comparator) {
                        var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
                            index = -1,
                            length = values.length,
                            seen = array;

                        if (array === values) {
                            values = copyArray(values);
                        }
                        if (iteratee) {
                            seen = arrayMap(array, baseUnary(iteratee));
                        }
                        while (++index < length) {
                            var fromIndex = 0,
                                value = values[index],
                                computed = iteratee ? iteratee(value) : value;

                            while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
                                if (seen !== array) {
                                    splice.call(seen, fromIndex, 1);
                                }
                                splice.call(array, fromIndex, 1);
                            }
                        }
                        return array;
                    }

                    /**
                     * The base implementation of `_.pullAt` without support for individual
                     * indexes or capturing the removed elements.
                     *
                     * @private
                     * @param {Array} array The array to modify.
                     * @param {number[]} indexes The indexes of elements to remove.
                     * @returns {Array} Returns `array`.
                     */
                    function basePullAt(array, indexes) {
                        var length = array ? indexes.length : 0,
                            lastIndex = length - 1;

                        while (length--) {
                            var index = indexes[length];
                            if (length == lastIndex || index !== previous) {
                                var previous = index;
                                if (isIndex(index)) {
                                    splice.call(array, index, 1);
                                } else {
                                    baseUnset(array, index);
                                }
                            }
                        }
                        return array;
                    }

                    /**
                     * The base implementation of `_.random` without support for returning
                     * floating-point numbers.
                     *
                     * @private
                     * @param {number} lower The lower bound.
                     * @param {number} upper The upper bound.
                     * @returns {number} Returns the random number.
                     */
                    function baseRandom(lower, upper) {
                        return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
                    }

                    /**
                     * The base implementation of `_.range` and `_.rangeRight` which doesn't
                     * coerce arguments.
                     *
                     * @private
                     * @param {number} start The start of the range.
                     * @param {number} end The end of the range.
                     * @param {number} step The value to increment or decrement by.
                     * @param {boolean} [fromRight] Specify iterating from right to left.
                     * @returns {Array} Returns the range of numbers.
                     */
                    function baseRange(start, end, step, fromRight) {
                        var index = -1,
                            length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
                            result = Array(length);

                        while (length--) {
                            result[fromRight ? length : ++index] = start;
                            start += step;
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `_.repeat` which doesn't coerce arguments.
                     *
                     * @private
                     * @param {string} string The string to repeat.
                     * @param {number} n The number of times to repeat the string.
                     * @returns {string} Returns the repeated string.
                     */
                    function baseRepeat(string, n) {
                        var result = '';
                        if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
                            return result;
                        }
                        // Leverage the exponentiation by squaring algorithm for a faster repeat.
                        // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
                        do {
                            if (n % 2) {
                                result += string;
                            }
                            n = nativeFloor(n / 2);
                            if (n) {
                                string += string;
                            }
                        } while (n);

                        return result;
                    }

                    /**
                     * The base implementation of `_.rest` which doesn't validate or coerce arguments.
                     *
                     * @private
                     * @param {Function} func The function to apply a rest parameter to.
                     * @param {number} [start=func.length-1] The start position of the rest parameter.
                     * @returns {Function} Returns the new function.
                     */
                    function baseRest(func, start) {
                        return setToString(overRest(func, start, identity), func + '');
                    }

                    /**
                     * The base implementation of `_.sample`.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to sample.
                     * @returns {*} Returns the random element.
                     */
                    function baseSample(collection) {
                        return arraySample(values(collection));
                    }

                    /**
                     * The base implementation of `_.sampleSize` without param guards.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to sample.
                     * @param {number} n The number of elements to sample.
                     * @returns {Array} Returns the random elements.
                     */
                    function baseSampleSize(collection, n) {
                        var array = values(collection);
                        return shuffleSelf(array, baseClamp(n, 0, array.length));
                    }

                    /**
                     * The base implementation of `_.set`.
                     *
                     * @private
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The path of the property to set.
                     * @param {*} value The value to set.
                     * @param {Function} [customizer] The function to customize path creation.
                     * @returns {Object} Returns `object`.
                     */
                    function baseSet(object, path, value, customizer) {
                        if (!isObject(object)) {
                            return object;
                        }
                        path = castPath(path, object);

                        var index = -1,
                            length = path.length,
                            lastIndex = length - 1,
                            nested = object;

                        while (nested != null && ++index < length) {
                            var key = toKey(path[index]),
                                newValue = value;

                            if (index != lastIndex) {
                                var objValue = nested[key];
                                newValue = customizer ? customizer(objValue, key, nested) : undefined;
                                if (newValue === undefined) {
                                    newValue = isObject(objValue)
                                        ? objValue
                                        : (isIndex(path[index + 1]) ? [] : {});
                                }
                            }
                            assignValue(nested, key, newValue);
                            nested = nested[key];
                        }
                        return object;
                    }

                    /**
                     * The base implementation of `setData` without support for hot loop shorting.
                     *
                     * @private
                     * @param {Function} func The function to associate metadata with.
                     * @param {*} data The metadata.
                     * @returns {Function} Returns `func`.
                     */
                    var baseSetData = !metaMap ? identity : function(func, data) {
                        metaMap.set(func, data);
                        return func;
                    };

                    /**
                     * The base implementation of `setToString` without support for hot loop shorting.
                     *
                     * @private
                     * @param {Function} func The function to modify.
                     * @param {Function} string The `toString` result.
                     * @returns {Function} Returns `func`.
                     */
                    var baseSetToString = !defineProperty ? identity : function(func, string) {
                        return defineProperty(func, 'toString', {
                            'configurable': true,
                            'enumerable': false,
                            'value': constant(string),
                            'writable': true
                        });
                    };

                    /**
                     * The base implementation of `_.shuffle`.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to shuffle.
                     * @returns {Array} Returns the new shuffled array.
                     */
                    function baseShuffle(collection) {
                        return shuffleSelf(values(collection));
                    }

                    /**
                     * The base implementation of `_.slice` without an iteratee call guard.
                     *
                     * @private
                     * @param {Array} array The array to slice.
                     * @param {number} [start=0] The start position.
                     * @param {number} [end=array.length] The end position.
                     * @returns {Array} Returns the slice of `array`.
                     */
                    function baseSlice(array, start, end) {
                        var index = -1,
                            length = array.length;

                        if (start < 0) {
                            start = -start > length ? 0 : (length + start);
                        }
                        end = end > length ? length : end;
                        if (end < 0) {
                            end += length;
                        }
                        length = start > end ? 0 : ((end - start) >>> 0);
                        start >>>= 0;

                        var result = Array(length);
                        while (++index < length) {
                            result[index] = array[index + start];
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `_.some` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} predicate The function invoked per iteration.
                     * @returns {boolean} Returns `true` if any element passes the predicate check,
                     *  else `false`.
                     */
                    function baseSome(collection, predicate) {
                        var result;

                        baseEach(collection, function(value, index, collection) {
                            result = predicate(value, index, collection);
                            return !result;
                        });
                        return !!result;
                    }

                    /**
                     * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
                     * performs a binary search of `array` to determine the index at which `value`
                     * should be inserted into `array` in order to maintain its sort order.
                     *
                     * @private
                     * @param {Array} array The sorted array to inspect.
                     * @param {*} value The value to evaluate.
                     * @param {boolean} [retHighest] Specify returning the highest qualified index.
                     * @returns {number} Returns the index at which `value` should be inserted
                     *  into `array`.
                     */
                    function baseSortedIndex(array, value, retHighest) {
                        var low = 0,
                            high = array == null ? low : array.length;

                        if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
                            while (low < high) {
                                var mid = (low + high) >>> 1,
                                    computed = array[mid];

                                if (computed !== null && !isSymbol(computed) &&
                                    (retHighest ? (computed <= value) : (computed < value))) {
                                    low = mid + 1;
                                } else {
                                    high = mid;
                                }
                            }
                            return high;
                        }
                        return baseSortedIndexBy(array, value, identity, retHighest);
                    }

                    /**
                     * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
                     * which invokes `iteratee` for `value` and each element of `array` to compute
                     * their sort ranking. The iteratee is invoked with one argument; (value).
                     *
                     * @private
                     * @param {Array} array The sorted array to inspect.
                     * @param {*} value The value to evaluate.
                     * @param {Function} iteratee The iteratee invoked per element.
                     * @param {boolean} [retHighest] Specify returning the highest qualified index.
                     * @returns {number} Returns the index at which `value` should be inserted
                     *  into `array`.
                     */
                    function baseSortedIndexBy(array, value, iteratee, retHighest) {
                        value = iteratee(value);

                        var low = 0,
                            high = array == null ? 0 : array.length,
                            valIsNaN = value !== value,
                            valIsNull = value === null,
                            valIsSymbol = isSymbol(value),
                            valIsUndefined = value === undefined;

                        while (low < high) {
                            var mid = nativeFloor((low + high) / 2),
                                computed = iteratee(array[mid]),
                                othIsDefined = computed !== undefined,
                                othIsNull = computed === null,
                                othIsReflexive = computed === computed,
                                othIsSymbol = isSymbol(computed);

                            if (valIsNaN) {
                                var setLow = retHighest || othIsReflexive;
                            } else if (valIsUndefined) {
                                setLow = othIsReflexive && (retHighest || othIsDefined);
                            } else if (valIsNull) {
                                setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
                            } else if (valIsSymbol) {
                                setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
                            } else if (othIsNull || othIsSymbol) {
                                setLow = false;
                            } else {
                                setLow = retHighest ? (computed <= value) : (computed < value);
                            }
                            if (setLow) {
                                low = mid + 1;
                            } else {
                                high = mid;
                            }
                        }
                        return nativeMin(high, MAX_ARRAY_INDEX);
                    }

                    /**
                     * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
                     * support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array} array The array to inspect.
                     * @param {Function} [iteratee] The iteratee invoked per element.
                     * @returns {Array} Returns the new duplicate free array.
                     */
                    function baseSortedUniq(array, iteratee) {
                        var index = -1,
                            length = array.length,
                            resIndex = 0,
                            result = [];

                        while (++index < length) {
                            var value = array[index],
                                computed = iteratee ? iteratee(value) : value;

                            if (!index || !eq(computed, seen)) {
                                var seen = computed;
                                result[resIndex++] = value === 0 ? 0 : value;
                            }
                        }
                        return result;
                    }

                    /**
                     * The base implementation of `_.toNumber` which doesn't ensure correct
                     * conversions of binary, hexadecimal, or octal string values.
                     *
                     * @private
                     * @param {*} value The value to process.
                     * @returns {number} Returns the number.
                     */
                    function baseToNumber(value) {
                        if (typeof value == 'number') {
                            return value;
                        }
                        if (isSymbol(value)) {
                            return NAN;
                        }
                        return +value;
                    }

                    /**
                     * The base implementation of `_.toString` which doesn't convert nullish
                     * values to empty strings.
                     *
                     * @private
                     * @param {*} value The value to process.
                     * @returns {string} Returns the string.
                     */
                    function baseToString(value) {
                        // Exit early for strings to avoid a performance hit in some environments.
                        if (typeof value == 'string') {
                            return value;
                        }
                        if (isArray(value)) {
                            // Recursively convert values (susceptible to call stack limits).
                            return arrayMap(value, baseToString) + '';
                        }
                        if (isSymbol(value)) {
                            return symbolToString ? symbolToString.call(value) : '';
                        }
                        var result = (value + '');
                        return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
                    }

                    /**
                     * The base implementation of `_.uniqBy` without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array} array The array to inspect.
                     * @param {Function} [iteratee] The iteratee invoked per element.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new duplicate free array.
                     */
                    function baseUniq(array, iteratee, comparator) {
                        var index = -1,
                            includes = arrayIncludes,
                            length = array.length,
                            isCommon = true,
                            result = [],
                            seen = result;

                        if (comparator) {
                            isCommon = false;
                            includes = arrayIncludesWith;
                        }
                        else if (length >= LARGE_ARRAY_SIZE) {
                            var set = iteratee ? null : createSet(array);
                            if (set) {
                                return setToArray(set);
                            }
                            isCommon = false;
                            includes = cacheHas;
                            seen = new SetCache;
                        }
                        else {
                            seen = iteratee ? [] : result;
                        }
                        outer:
                            while (++index < length) {
                                var value = array[index],
                                    computed = iteratee ? iteratee(value) : value;

                                value = (comparator || value !== 0) ? value : 0;
                                if (isCommon && computed === computed) {
                                    var seenIndex = seen.length;
                                    while (seenIndex--) {
                                        if (seen[seenIndex] === computed) {
                                            continue outer;
                                        }
                                    }
                                    if (iteratee) {
                                        seen.push(computed);
                                    }
                                    result.push(value);
                                }
                                else if (!includes(seen, computed, comparator)) {
                                    if (seen !== result) {
                                        seen.push(computed);
                                    }
                                    result.push(value);
                                }
                            }
                        return result;
                    }

                    /**
                     * The base implementation of `_.unset`.
                     *
                     * @private
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The property path to unset.
                     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
                     */
                    function baseUnset(object, path) {
                        path = castPath(path, object);
                        object = parent(object, path);
                        return object == null || delete object[toKey(last(path))];
                    }

                    /**
                     * The base implementation of `_.update`.
                     *
                     * @private
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The path of the property to update.
                     * @param {Function} updater The function to produce the updated value.
                     * @param {Function} [customizer] The function to customize path creation.
                     * @returns {Object} Returns `object`.
                     */
                    function baseUpdate(object, path, updater, customizer) {
                        return baseSet(object, path, updater(baseGet(object, path)), customizer);
                    }

                    /**
                     * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
                     * without support for iteratee shorthands.
                     *
                     * @private
                     * @param {Array} array The array to query.
                     * @param {Function} predicate The function invoked per iteration.
                     * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
                     * @param {boolean} [fromRight] Specify iterating from right to left.
                     * @returns {Array} Returns the slice of `array`.
                     */
                    function baseWhile(array, predicate, isDrop, fromRight) {
                        var length = array.length,
                            index = fromRight ? length : -1;

                        while ((fromRight ? index-- : ++index < length) &&
                        predicate(array[index], index, array)) {}

                        return isDrop
                            ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
                            : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
                    }

                    /**
                     * The base implementation of `wrapperValue` which returns the result of
                     * performing a sequence of actions on the unwrapped `value`, where each
                     * successive action is supplied the return value of the previous.
                     *
                     * @private
                     * @param {*} value The unwrapped value.
                     * @param {Array} actions Actions to perform to resolve the unwrapped value.
                     * @returns {*} Returns the resolved value.
                     */
                    function baseWrapperValue(value, actions) {
                        var result = value;
                        if (result instanceof LazyWrapper) {
                            result = result.value();
                        }
                        return arrayReduce(actions, function(result, action) {
                            return action.func.apply(action.thisArg, arrayPush([result], action.args));
                        }, result);
                    }

                    /**
                     * The base implementation of methods like `_.xor`, without support for
                     * iteratee shorthands, that accepts an array of arrays to inspect.
                     *
                     * @private
                     * @param {Array} arrays The arrays to inspect.
                     * @param {Function} [iteratee] The iteratee invoked per element.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new array of values.
                     */
                    function baseXor(arrays, iteratee, comparator) {
                        var length = arrays.length;
                        if (length < 2) {
                            return length ? baseUniq(arrays[0]) : [];
                        }
                        var index = -1,
                            result = Array(length);

                        while (++index < length) {
                            var array = arrays[index],
                                othIndex = -1;

                            while (++othIndex < length) {
                                if (othIndex != index) {
                                    result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
                                }
                            }
                        }
                        return baseUniq(baseFlatten(result, 1), iteratee, comparator);
                    }

                    /**
                     * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
                     *
                     * @private
                     * @param {Array} props The property identifiers.
                     * @param {Array} values The property values.
                     * @param {Function} assignFunc The function to assign values.
                     * @returns {Object} Returns the new object.
                     */
                    function baseZipObject(props, values, assignFunc) {
                        var index = -1,
                            length = props.length,
                            valsLength = values.length,
                            result = {};

                        while (++index < length) {
                            var value = index < valsLength ? values[index] : undefined;
                            assignFunc(result, props[index], value);
                        }
                        return result;
                    }

                    /**
                     * Casts `value` to an empty array if it's not an array like object.
                     *
                     * @private
                     * @param {*} value The value to inspect.
                     * @returns {Array|Object} Returns the cast array-like object.
                     */
                    function castArrayLikeObject(value) {
                        return isArrayLikeObject(value) ? value : [];
                    }

                    /**
                     * Casts `value` to `identity` if it's not a function.
                     *
                     * @private
                     * @param {*} value The value to inspect.
                     * @returns {Function} Returns cast function.
                     */
                    function castFunction(value) {
                        return typeof value == 'function' ? value : identity;
                    }

                    /**
                     * Casts `value` to a path array if it's not one.
                     *
                     * @private
                     * @param {*} value The value to inspect.
                     * @param {Object} [object] The object to query keys on.
                     * @returns {Array} Returns the cast property path array.
                     */
                    function castPath(value, object) {
                        if (isArray(value)) {
                            return value;
                        }
                        return isKey(value, object) ? [value] : stringToPath(toString(value));
                    }

                    /**
                     * A `baseRest` alias which can be replaced with `identity` by module
                     * replacement plugins.
                     *
                     * @private
                     * @type {Function}
                     * @param {Function} func The function to apply a rest parameter to.
                     * @returns {Function} Returns the new function.
                     */
                    var castRest = baseRest;

                    /**
                     * Casts `array` to a slice if it's needed.
                     *
                     * @private
                     * @param {Array} array The array to inspect.
                     * @param {number} start The start position.
                     * @param {number} [end=array.length] The end position.
                     * @returns {Array} Returns the cast slice.
                     */
                    function castSlice(array, start, end) {
                        var length = array.length;
                        end = end === undefined ? length : end;
                        return (!start && end >= length) ? array : baseSlice(array, start, end);
                    }

                    /**
                     * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
                     *
                     * @private
                     * @param {number|Object} id The timer id or timeout object of the timer to clear.
                     */
                    var clearTimeout = ctxClearTimeout || function(id) {
                        return root.clearTimeout(id);
                    };

                    /**
                     * Creates a clone of  `buffer`.
                     *
                     * @private
                     * @param {Buffer} buffer The buffer to clone.
                     * @param {boolean} [isDeep] Specify a deep clone.
                     * @returns {Buffer} Returns the cloned buffer.
                     */
                    function cloneBuffer(buffer, isDeep) {
                        if (isDeep) {
                            return buffer.slice();
                        }
                        var length = buffer.length,
                            result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);

                        buffer.copy(result);
                        return result;
                    }

                    /**
                     * Creates a clone of `arrayBuffer`.
                     *
                     * @private
                     * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
                     * @returns {ArrayBuffer} Returns the cloned array buffer.
                     */
                    function cloneArrayBuffer(arrayBuffer) {
                        var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
                        new Uint8Array(result).set(new Uint8Array(arrayBuffer));
                        return result;
                    }

                    /**
                     * Creates a clone of `dataView`.
                     *
                     * @private
                     * @param {Object} dataView The data view to clone.
                     * @param {boolean} [isDeep] Specify a deep clone.
                     * @returns {Object} Returns the cloned data view.
                     */
                    function cloneDataView(dataView, isDeep) {
                        var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
                        return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
                    }

                    /**
                     * Creates a clone of `map`.
                     *
                     * @private
                     * @param {Object} map The map to clone.
                     * @param {Function} cloneFunc The function to clone values.
                     * @param {boolean} [isDeep] Specify a deep clone.
                     * @returns {Object} Returns the cloned map.
                     */
                    function cloneMap(map, isDeep, cloneFunc) {
                        var array = isDeep ? cloneFunc(mapToArray(map), CLONE_DEEP_FLAG) : mapToArray(map);
                        return arrayReduce(array, addMapEntry, new map.constructor);
                    }

                    /**
                     * Creates a clone of `regexp`.
                     *
                     * @private
                     * @param {Object} regexp The regexp to clone.
                     * @returns {Object} Returns the cloned regexp.
                     */
                    function cloneRegExp(regexp) {
                        var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
                        result.lastIndex = regexp.lastIndex;
                        return result;
                    }

                    /**
                     * Creates a clone of `set`.
                     *
                     * @private
                     * @param {Object} set The set to clone.
                     * @param {Function} cloneFunc The function to clone values.
                     * @param {boolean} [isDeep] Specify a deep clone.
                     * @returns {Object} Returns the cloned set.
                     */
                    function cloneSet(set, isDeep, cloneFunc) {
                        var array = isDeep ? cloneFunc(setToArray(set), CLONE_DEEP_FLAG) : setToArray(set);
                        return arrayReduce(array, addSetEntry, new set.constructor);
                    }

                    /**
                     * Creates a clone of the `symbol` object.
                     *
                     * @private
                     * @param {Object} symbol The symbol object to clone.
                     * @returns {Object} Returns the cloned symbol object.
                     */
                    function cloneSymbol(symbol) {
                        return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
                    }

                    /**
                     * Creates a clone of `typedArray`.
                     *
                     * @private
                     * @param {Object} typedArray The typed array to clone.
                     * @param {boolean} [isDeep] Specify a deep clone.
                     * @returns {Object} Returns the cloned typed array.
                     */
                    function cloneTypedArray(typedArray, isDeep) {
                        var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
                        return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
                    }

                    /**
                     * Compares values to sort them in ascending order.
                     *
                     * @private
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {number} Returns the sort order indicator for `value`.
                     */
                    function compareAscending(value, other) {
                        if (value !== other) {
                            var valIsDefined = value !== undefined,
                                valIsNull = value === null,
                                valIsReflexive = value === value,
                                valIsSymbol = isSymbol(value);

                            var othIsDefined = other !== undefined,
                                othIsNull = other === null,
                                othIsReflexive = other === other,
                                othIsSymbol = isSymbol(other);

                            if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
                                (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
                                (valIsNull && othIsDefined && othIsReflexive) ||
                                (!valIsDefined && othIsReflexive) ||
                                !valIsReflexive) {
                                return 1;
                            }
                            if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
                                (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
                                (othIsNull && valIsDefined && valIsReflexive) ||
                                (!othIsDefined && valIsReflexive) ||
                                !othIsReflexive) {
                                return -1;
                            }
                        }
                        return 0;
                    }

                    /**
                     * Used by `_.orderBy` to compare multiple properties of a value to another
                     * and stable sort them.
                     *
                     * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
                     * specify an order of "desc" for descending or "asc" for ascending sort order
                     * of corresponding values.
                     *
                     * @private
                     * @param {Object} object The object to compare.
                     * @param {Object} other The other object to compare.
                     * @param {boolean[]|string[]} orders The order to sort by for each property.
                     * @returns {number} Returns the sort order indicator for `object`.
                     */
                    function compareMultiple(object, other, orders) {
                        var index = -1,
                            objCriteria = object.criteria,
                            othCriteria = other.criteria,
                            length = objCriteria.length,
                            ordersLength = orders.length;

                        while (++index < length) {
                            var result = compareAscending(objCriteria[index], othCriteria[index]);
                            if (result) {
                                if (index >= ordersLength) {
                                    return result;
                                }
                                var order = orders[index];
                                return result * (order == 'desc' ? -1 : 1);
                            }
                        }
                        // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
                        // that causes it, under certain circumstances, to provide the same value for
                        // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
                        // for more details.
                        //
                        // This also ensures a stable sort in V8 and other engines.
                        // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
                        return object.index - other.index;
                    }

                    /**
                     * Creates an array that is the composition of partially applied arguments,
                     * placeholders, and provided arguments into a single array of arguments.
                     *
                     * @private
                     * @param {Array} args The provided arguments.
                     * @param {Array} partials The arguments to prepend to those provided.
                     * @param {Array} holders The `partials` placeholder indexes.
                     * @params {boolean} [isCurried] Specify composing for a curried function.
                     * @returns {Array} Returns the new array of composed arguments.
                     */
                    function composeArgs(args, partials, holders, isCurried) {
                        var argsIndex = -1,
                            argsLength = args.length,
                            holdersLength = holders.length,
                            leftIndex = -1,
                            leftLength = partials.length,
                            rangeLength = nativeMax(argsLength - holdersLength, 0),
                            result = Array(leftLength + rangeLength),
                            isUncurried = !isCurried;

                        while (++leftIndex < leftLength) {
                            result[leftIndex] = partials[leftIndex];
                        }
                        while (++argsIndex < holdersLength) {
                            if (isUncurried || argsIndex < argsLength) {
                                result[holders[argsIndex]] = args[argsIndex];
                            }
                        }
                        while (rangeLength--) {
                            result[leftIndex++] = args[argsIndex++];
                        }
                        return result;
                    }

                    /**
                     * This function is like `composeArgs` except that the arguments composition
                     * is tailored for `_.partialRight`.
                     *
                     * @private
                     * @param {Array} args The provided arguments.
                     * @param {Array} partials The arguments to append to those provided.
                     * @param {Array} holders The `partials` placeholder indexes.
                     * @params {boolean} [isCurried] Specify composing for a curried function.
                     * @returns {Array} Returns the new array of composed arguments.
                     */
                    function composeArgsRight(args, partials, holders, isCurried) {
                        var argsIndex = -1,
                            argsLength = args.length,
                            holdersIndex = -1,
                            holdersLength = holders.length,
                            rightIndex = -1,
                            rightLength = partials.length,
                            rangeLength = nativeMax(argsLength - holdersLength, 0),
                            result = Array(rangeLength + rightLength),
                            isUncurried = !isCurried;

                        while (++argsIndex < rangeLength) {
                            result[argsIndex] = args[argsIndex];
                        }
                        var offset = argsIndex;
                        while (++rightIndex < rightLength) {
                            result[offset + rightIndex] = partials[rightIndex];
                        }
                        while (++holdersIndex < holdersLength) {
                            if (isUncurried || argsIndex < argsLength) {
                                result[offset + holders[holdersIndex]] = args[argsIndex++];
                            }
                        }
                        return result;
                    }

                    /**
                     * Copies the values of `source` to `array`.
                     *
                     * @private
                     * @param {Array} source The array to copy values from.
                     * @param {Array} [array=[]] The array to copy values to.
                     * @returns {Array} Returns `array`.
                     */
                    function copyArray(source, array) {
                        var index = -1,
                            length = source.length;

                        array || (array = Array(length));
                        while (++index < length) {
                            array[index] = source[index];
                        }
                        return array;
                    }

                    /**
                     * Copies properties of `source` to `object`.
                     *
                     * @private
                     * @param {Object} source The object to copy properties from.
                     * @param {Array} props The property identifiers to copy.
                     * @param {Object} [object={}] The object to copy properties to.
                     * @param {Function} [customizer] The function to customize copied values.
                     * @returns {Object} Returns `object`.
                     */
                    function copyObject(source, props, object, customizer) {
                        var isNew = !object;
                        object || (object = {});

                        var index = -1,
                            length = props.length;

                        while (++index < length) {
                            var key = props[index];

                            var newValue = customizer
                                ? customizer(object[key], source[key], key, object, source)
                                : undefined;

                            if (newValue === undefined) {
                                newValue = source[key];
                            }
                            if (isNew) {
                                baseAssignValue(object, key, newValue);
                            } else {
                                assignValue(object, key, newValue);
                            }
                        }
                        return object;
                    }

                    /**
                     * Copies own symbols of `source` to `object`.
                     *
                     * @private
                     * @param {Object} source The object to copy symbols from.
                     * @param {Object} [object={}] The object to copy symbols to.
                     * @returns {Object} Returns `object`.
                     */
                    function copySymbols(source, object) {
                        return copyObject(source, getSymbols(source), object);
                    }

                    /**
                     * Copies own and inherited symbols of `source` to `object`.
                     *
                     * @private
                     * @param {Object} source The object to copy symbols from.
                     * @param {Object} [object={}] The object to copy symbols to.
                     * @returns {Object} Returns `object`.
                     */
                    function copySymbolsIn(source, object) {
                        return copyObject(source, getSymbolsIn(source), object);
                    }

                    /**
                     * Creates a function like `_.groupBy`.
                     *
                     * @private
                     * @param {Function} setter The function to set accumulator values.
                     * @param {Function} [initializer] The accumulator object initializer.
                     * @returns {Function} Returns the new aggregator function.
                     */
                    function createAggregator(setter, initializer) {
                        return function(collection, iteratee) {
                            var func = isArray(collection) ? arrayAggregator : baseAggregator,
                                accumulator = initializer ? initializer() : {};

                            return func(collection, setter, getIteratee(iteratee, 2), accumulator);
                        };
                    }

                    /**
                     * Creates a function like `_.assign`.
                     *
                     * @private
                     * @param {Function} assigner The function to assign values.
                     * @returns {Function} Returns the new assigner function.
                     */
                    function createAssigner(assigner) {
                        return baseRest(function(object, sources) {
                            var index = -1,
                                length = sources.length,
                                customizer = length > 1 ? sources[length - 1] : undefined,
                                guard = length > 2 ? sources[2] : undefined;

                            customizer = (assigner.length > 3 && typeof customizer == 'function')
                                ? (length--, customizer)
                                : undefined;

                            if (guard && isIterateeCall(sources[0], sources[1], guard)) {
                                customizer = length < 3 ? undefined : customizer;
                                length = 1;
                            }
                            object = Object(object);
                            while (++index < length) {
                                var source = sources[index];
                                if (source) {
                                    assigner(object, source, index, customizer);
                                }
                            }
                            return object;
                        });
                    }

                    /**
                     * Creates a `baseEach` or `baseEachRight` function.
                     *
                     * @private
                     * @param {Function} eachFunc The function to iterate over a collection.
                     * @param {boolean} [fromRight] Specify iterating from right to left.
                     * @returns {Function} Returns the new base function.
                     */
                    function createBaseEach(eachFunc, fromRight) {
                        return function(collection, iteratee) {
                            if (collection == null) {
                                return collection;
                            }
                            if (!isArrayLike(collection)) {
                                return eachFunc(collection, iteratee);
                            }
                            var length = collection.length,
                                index = fromRight ? length : -1,
                                iterable = Object(collection);

                            while ((fromRight ? index-- : ++index < length)) {
                                if (iteratee(iterable[index], index, iterable) === false) {
                                    break;
                                }
                            }
                            return collection;
                        };
                    }

                    /**
                     * Creates a base function for methods like `_.forIn` and `_.forOwn`.
                     *
                     * @private
                     * @param {boolean} [fromRight] Specify iterating from right to left.
                     * @returns {Function} Returns the new base function.
                     */
                    function createBaseFor(fromRight) {
                        return function(object, iteratee, keysFunc) {
                            var index = -1,
                                iterable = Object(object),
                                props = keysFunc(object),
                                length = props.length;

                            while (length--) {
                                var key = props[fromRight ? length : ++index];
                                if (iteratee(iterable[key], key, iterable) === false) {
                                    break;
                                }
                            }
                            return object;
                        };
                    }

                    /**
                     * Creates a function that wraps `func` to invoke it with the optional `this`
                     * binding of `thisArg`.
                     *
                     * @private
                     * @param {Function} func The function to wrap.
                     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
                     * @param {*} [thisArg] The `this` binding of `func`.
                     * @returns {Function} Returns the new wrapped function.
                     */
                    function createBind(func, bitmask, thisArg) {
                        var isBind = bitmask & WRAP_BIND_FLAG,
                            Ctor = createCtor(func);

                        function wrapper() {
                            var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
                            return fn.apply(isBind ? thisArg : this, arguments);
                        }
                        return wrapper;
                    }

                    /**
                     * Creates a function like `_.lowerFirst`.
                     *
                     * @private
                     * @param {string} methodName The name of the `String` case method to use.
                     * @returns {Function} Returns the new case function.
                     */
                    function createCaseFirst(methodName) {
                        return function(string) {
                            string = toString(string);

                            var strSymbols = hasUnicode(string)
                                ? stringToArray(string)
                                : undefined;

                            var chr = strSymbols
                                ? strSymbols[0]
                                : string.charAt(0);

                            var trailing = strSymbols
                                ? castSlice(strSymbols, 1).join('')
                                : string.slice(1);

                            return chr[methodName]() + trailing;
                        };
                    }

                    /**
                     * Creates a function like `_.camelCase`.
                     *
                     * @private
                     * @param {Function} callback The function to combine each word.
                     * @returns {Function} Returns the new compounder function.
                     */
                    function createCompounder(callback) {
                        return function(string) {
                            return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
                        };
                    }

                    /**
                     * Creates a function that produces an instance of `Ctor` regardless of
                     * whether it was invoked as part of a `new` expression or by `call` or `apply`.
                     *
                     * @private
                     * @param {Function} Ctor The constructor to wrap.
                     * @returns {Function} Returns the new wrapped function.
                     */
                    function createCtor(Ctor) {
                        return function() {
                            // Use a `switch` statement to work with class constructors. See
                            // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
                            // for more details.
                            var args = arguments;
                            switch (args.length) {
                                case 0: return new Ctor;
                                case 1: return new Ctor(args[0]);
                                case 2: return new Ctor(args[0], args[1]);
                                case 3: return new Ctor(args[0], args[1], args[2]);
                                case 4: return new Ctor(args[0], args[1], args[2], args[3]);
                                case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
                                case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
                                case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
                            }
                            var thisBinding = baseCreate(Ctor.prototype),
                                result = Ctor.apply(thisBinding, args);

                            // Mimic the constructor's `return` behavior.
                            // See https://es5.github.io/#x13.2.2 for more details.
                            return isObject(result) ? result : thisBinding;
                        };
                    }

                    /**
                     * Creates a function that wraps `func` to enable currying.
                     *
                     * @private
                     * @param {Function} func The function to wrap.
                     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
                     * @param {number} arity The arity of `func`.
                     * @returns {Function} Returns the new wrapped function.
                     */
                    function createCurry(func, bitmask, arity) {
                        var Ctor = createCtor(func);

                        function wrapper() {
                            var length = arguments.length,
                                args = Array(length),
                                index = length,
                                placeholder = getHolder(wrapper);

                            while (index--) {
                                args[index] = arguments[index];
                            }
                            var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
                                ? []
                                : replaceHolders(args, placeholder);

                            length -= holders.length;
                            if (length < arity) {
                                return createRecurry(
                                    func, bitmask, createHybrid, wrapper.placeholder, undefined,
                                    args, holders, undefined, undefined, arity - length);
                            }
                            var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
                            return apply(fn, this, args);
                        }
                        return wrapper;
                    }

                    /**
                     * Creates a `_.find` or `_.findLast` function.
                     *
                     * @private
                     * @param {Function} findIndexFunc The function to find the collection index.
                     * @returns {Function} Returns the new find function.
                     */
                    function createFind(findIndexFunc) {
                        return function(collection, predicate, fromIndex) {
                            var iterable = Object(collection);
                            if (!isArrayLike(collection)) {
                                var iteratee = getIteratee(predicate, 3);
                                collection = keys(collection);
                                predicate = function(key) { return iteratee(iterable[key], key, iterable); };
                            }
                            var index = findIndexFunc(collection, predicate, fromIndex);
                            return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
                        };
                    }

                    /**
                     * Creates a `_.flow` or `_.flowRight` function.
                     *
                     * @private
                     * @param {boolean} [fromRight] Specify iterating from right to left.
                     * @returns {Function} Returns the new flow function.
                     */
                    function createFlow(fromRight) {
                        return flatRest(function(funcs) {
                            var length = funcs.length,
                                index = length,
                                prereq = LodashWrapper.prototype.thru;

                            if (fromRight) {
                                funcs.reverse();
                            }
                            while (index--) {
                                var func = funcs[index];
                                if (typeof func != 'function') {
                                    throw new TypeError(FUNC_ERROR_TEXT);
                                }
                                if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
                                    var wrapper = new LodashWrapper([], true);
                                }
                            }
                            index = wrapper ? index : length;
                            while (++index < length) {
                                func = funcs[index];

                                var funcName = getFuncName(func),
                                    data = funcName == 'wrapper' ? getData(func) : undefined;

                                if (data && isLaziable(data[0]) &&
                                    data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
                                    !data[4].length && data[9] == 1
                                ) {
                                    wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
                                } else {
                                    wrapper = (func.length == 1 && isLaziable(func))
                                        ? wrapper[funcName]()
                                        : wrapper.thru(func);
                                }
                            }
                            return function() {
                                var args = arguments,
                                    value = args[0];

                                if (wrapper && args.length == 1 && isArray(value)) {
                                    return wrapper.plant(value).value();
                                }
                                var index = 0,
                                    result = length ? funcs[index].apply(this, args) : value;

                                while (++index < length) {
                                    result = funcs[index].call(this, result);
                                }
                                return result;
                            };
                        });
                    }

                    /**
                     * Creates a function that wraps `func` to invoke it with optional `this`
                     * binding of `thisArg`, partial application, and currying.
                     *
                     * @private
                     * @param {Function|string} func The function or method name to wrap.
                     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
                     * @param {*} [thisArg] The `this` binding of `func`.
                     * @param {Array} [partials] The arguments to prepend to those provided to
                     *  the new function.
                     * @param {Array} [holders] The `partials` placeholder indexes.
                     * @param {Array} [partialsRight] The arguments to append to those provided
                     *  to the new function.
                     * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
                     * @param {Array} [argPos] The argument positions of the new function.
                     * @param {number} [ary] The arity cap of `func`.
                     * @param {number} [arity] The arity of `func`.
                     * @returns {Function} Returns the new wrapped function.
                     */
                    function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
                        var isAry = bitmask & WRAP_ARY_FLAG,
                            isBind = bitmask & WRAP_BIND_FLAG,
                            isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
                            isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
                            isFlip = bitmask & WRAP_FLIP_FLAG,
                            Ctor = isBindKey ? undefined : createCtor(func);

                        function wrapper() {
                            var length = arguments.length,
                                args = Array(length),
                                index = length;

                            while (index--) {
                                args[index] = arguments[index];
                            }
                            if (isCurried) {
                                var placeholder = getHolder(wrapper),
                                    holdersCount = countHolders(args, placeholder);
                            }
                            if (partials) {
                                args = composeArgs(args, partials, holders, isCurried);
                            }
                            if (partialsRight) {
                                args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
                            }
                            length -= holdersCount;
                            if (isCurried && length < arity) {
                                var newHolders = replaceHolders(args, placeholder);
                                return createRecurry(
                                    func, bitmask, createHybrid, wrapper.placeholder, thisArg,
                                    args, newHolders, argPos, ary, arity - length
                                );
                            }
                            var thisBinding = isBind ? thisArg : this,
                                fn = isBindKey ? thisBinding[func] : func;

                            length = args.length;
                            if (argPos) {
                                args = reorder(args, argPos);
                            } else if (isFlip && length > 1) {
                                args.reverse();
                            }
                            if (isAry && ary < length) {
                                args.length = ary;
                            }
                            if (this && this !== root && this instanceof wrapper) {
                                fn = Ctor || createCtor(fn);
                            }
                            return fn.apply(thisBinding, args);
                        }
                        return wrapper;
                    }

                    /**
                     * Creates a function like `_.invertBy`.
                     *
                     * @private
                     * @param {Function} setter The function to set accumulator values.
                     * @param {Function} toIteratee The function to resolve iteratees.
                     * @returns {Function} Returns the new inverter function.
                     */
                    function createInverter(setter, toIteratee) {
                        return function(object, iteratee) {
                            return baseInverter(object, setter, toIteratee(iteratee), {});
                        };
                    }

                    /**
                     * Creates a function that performs a mathematical operation on two values.
                     *
                     * @private
                     * @param {Function} operator The function to perform the operation.
                     * @param {number} [defaultValue] The value used for `undefined` arguments.
                     * @returns {Function} Returns the new mathematical operation function.
                     */
                    function createMathOperation(operator, defaultValue) {
                        return function(value, other) {
                            var result;
                            if (value === undefined && other === undefined) {
                                return defaultValue;
                            }
                            if (value !== undefined) {
                                result = value;
                            }
                            if (other !== undefined) {
                                if (result === undefined) {
                                    return other;
                                }
                                if (typeof value == 'string' || typeof other == 'string') {
                                    value = baseToString(value);
                                    other = baseToString(other);
                                } else {
                                    value = baseToNumber(value);
                                    other = baseToNumber(other);
                                }
                                result = operator(value, other);
                            }
                            return result;
                        };
                    }

                    /**
                     * Creates a function like `_.over`.
                     *
                     * @private
                     * @param {Function} arrayFunc The function to iterate over iteratees.
                     * @returns {Function} Returns the new over function.
                     */
                    function createOver(arrayFunc) {
                        return flatRest(function(iteratees) {
                            iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
                            return baseRest(function(args) {
                                var thisArg = this;
                                return arrayFunc(iteratees, function(iteratee) {
                                    return apply(iteratee, thisArg, args);
                                });
                            });
                        });
                    }

                    /**
                     * Creates the padding for `string` based on `length`. The `chars` string
                     * is truncated if the number of characters exceeds `length`.
                     *
                     * @private
                     * @param {number} length The padding length.
                     * @param {string} [chars=' '] The string used as padding.
                     * @returns {string} Returns the padding for `string`.
                     */
                    function createPadding(length, chars) {
                        chars = chars === undefined ? ' ' : baseToString(chars);

                        var charsLength = chars.length;
                        if (charsLength < 2) {
                            return charsLength ? baseRepeat(chars, length) : chars;
                        }
                        var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
                        return hasUnicode(chars)
                            ? castSlice(stringToArray(result), 0, length).join('')
                            : result.slice(0, length);
                    }

                    /**
                     * Creates a function that wraps `func` to invoke it with the `this` binding
                     * of `thisArg` and `partials` prepended to the arguments it receives.
                     *
                     * @private
                     * @param {Function} func The function to wrap.
                     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
                     * @param {*} thisArg The `this` binding of `func`.
                     * @param {Array} partials The arguments to prepend to those provided to
                     *  the new function.
                     * @returns {Function} Returns the new wrapped function.
                     */
                    function createPartial(func, bitmask, thisArg, partials) {
                        var isBind = bitmask & WRAP_BIND_FLAG,
                            Ctor = createCtor(func);

                        function wrapper() {
                            var argsIndex = -1,
                                argsLength = arguments.length,
                                leftIndex = -1,
                                leftLength = partials.length,
                                args = Array(leftLength + argsLength),
                                fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;

                            while (++leftIndex < leftLength) {
                                args[leftIndex] = partials[leftIndex];
                            }
                            while (argsLength--) {
                                args[leftIndex++] = arguments[++argsIndex];
                            }
                            return apply(fn, isBind ? thisArg : this, args);
                        }
                        return wrapper;
                    }

                    /**
                     * Creates a `_.range` or `_.rangeRight` function.
                     *
                     * @private
                     * @param {boolean} [fromRight] Specify iterating from right to left.
                     * @returns {Function} Returns the new range function.
                     */
                    function createRange(fromRight) {
                        return function(start, end, step) {
                            if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
                                end = step = undefined;
                            }
                            // Ensure the sign of `-0` is preserved.
                            start = toFinite(start);
                            if (end === undefined) {
                                end = start;
                                start = 0;
                            } else {
                                end = toFinite(end);
                            }
                            step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
                            return baseRange(start, end, step, fromRight);
                        };
                    }

                    /**
                     * Creates a function that performs a relational operation on two values.
                     *
                     * @private
                     * @param {Function} operator The function to perform the operation.
                     * @returns {Function} Returns the new relational operation function.
                     */
                    function createRelationalOperation(operator) {
                        return function(value, other) {
                            if (!(typeof value == 'string' && typeof other == 'string')) {
                                value = toNumber(value);
                                other = toNumber(other);
                            }
                            return operator(value, other);
                        };
                    }

                    /**
                     * Creates a function that wraps `func` to continue currying.
                     *
                     * @private
                     * @param {Function} func The function to wrap.
                     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
                     * @param {Function} wrapFunc The function to create the `func` wrapper.
                     * @param {*} placeholder The placeholder value.
                     * @param {*} [thisArg] The `this` binding of `func`.
                     * @param {Array} [partials] The arguments to prepend to those provided to
                     *  the new function.
                     * @param {Array} [holders] The `partials` placeholder indexes.
                     * @param {Array} [argPos] The argument positions of the new function.
                     * @param {number} [ary] The arity cap of `func`.
                     * @param {number} [arity] The arity of `func`.
                     * @returns {Function} Returns the new wrapped function.
                     */
                    function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
                        var isCurry = bitmask & WRAP_CURRY_FLAG,
                            newHolders = isCurry ? holders : undefined,
                            newHoldersRight = isCurry ? undefined : holders,
                            newPartials = isCurry ? partials : undefined,
                            newPartialsRight = isCurry ? undefined : partials;

                        bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
                        bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);

                        if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
                            bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
                        }
                        var newData = [
                            func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
                            newHoldersRight, argPos, ary, arity
                        ];

                        var result = wrapFunc.apply(undefined, newData);
                        if (isLaziable(func)) {
                            setData(result, newData);
                        }
                        result.placeholder = placeholder;
                        return setWrapToString(result, func, bitmask);
                    }

                    /**
                     * Creates a function like `_.round`.
                     *
                     * @private
                     * @param {string} methodName The name of the `Math` method to use when rounding.
                     * @returns {Function} Returns the new round function.
                     */
                    function createRound(methodName) {
                        var func = Math[methodName];
                        return function(number, precision) {
                            number = toNumber(number);
                            precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
                            if (precision) {
                                // Shift with exponential notation to avoid floating-point issues.
                                // See [MDN](https://mdn.io/round#Examples) for more details.
                                var pair = (toString(number) + 'e').split('e'),
                                    value = func(pair[0] + 'e' + (+pair[1] + precision));

                                pair = (toString(value) + 'e').split('e');
                                return +(pair[0] + 'e' + (+pair[1] - precision));
                            }
                            return func(number);
                        };
                    }

                    /**
                     * Creates a set object of `values`.
                     *
                     * @private
                     * @param {Array} values The values to add to the set.
                     * @returns {Object} Returns the new set.
                     */
                    var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
                        return new Set(values);
                    };

                    /**
                     * Creates a `_.toPairs` or `_.toPairsIn` function.
                     *
                     * @private
                     * @param {Function} keysFunc The function to get the keys of a given object.
                     * @returns {Function} Returns the new pairs function.
                     */
                    function createToPairs(keysFunc) {
                        return function(object) {
                            var tag = getTag(object);
                            if (tag == mapTag) {
                                return mapToArray(object);
                            }
                            if (tag == setTag) {
                                return setToPairs(object);
                            }
                            return baseToPairs(object, keysFunc(object));
                        };
                    }

                    /**
                     * Creates a function that either curries or invokes `func` with optional
                     * `this` binding and partially applied arguments.
                     *
                     * @private
                     * @param {Function|string} func The function or method name to wrap.
                     * @param {number} bitmask The bitmask flags.
                     *    1 - `_.bind`
                     *    2 - `_.bindKey`
                     *    4 - `_.curry` or `_.curryRight` of a bound function
                     *    8 - `_.curry`
                     *   16 - `_.curryRight`
                     *   32 - `_.partial`
                     *   64 - `_.partialRight`
                     *  128 - `_.rearg`
                     *  256 - `_.ary`
                     *  512 - `_.flip`
                     * @param {*} [thisArg] The `this` binding of `func`.
                     * @param {Array} [partials] The arguments to be partially applied.
                     * @param {Array} [holders] The `partials` placeholder indexes.
                     * @param {Array} [argPos] The argument positions of the new function.
                     * @param {number} [ary] The arity cap of `func`.
                     * @param {number} [arity] The arity of `func`.
                     * @returns {Function} Returns the new wrapped function.
                     */
                    function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
                        var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
                        if (!isBindKey && typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        var length = partials ? partials.length : 0;
                        if (!length) {
                            bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
                            partials = holders = undefined;
                        }
                        ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
                        arity = arity === undefined ? arity : toInteger(arity);
                        length -= holders ? holders.length : 0;

                        if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
                            var partialsRight = partials,
                                holdersRight = holders;

                            partials = holders = undefined;
                        }
                        var data = isBindKey ? undefined : getData(func);

                        var newData = [
                            func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
                            argPos, ary, arity
                        ];

                        if (data) {
                            mergeData(newData, data);
                        }
                        func = newData[0];
                        bitmask = newData[1];
                        thisArg = newData[2];
                        partials = newData[3];
                        holders = newData[4];
                        arity = newData[9] = newData[9] === undefined
                            ? (isBindKey ? 0 : func.length)
                            : nativeMax(newData[9] - length, 0);

                        if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
                            bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
                        }
                        if (!bitmask || bitmask == WRAP_BIND_FLAG) {
                            var result = createBind(func, bitmask, thisArg);
                        } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
                            result = createCurry(func, bitmask, arity);
                        } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
                            result = createPartial(func, bitmask, thisArg, partials);
                        } else {
                            result = createHybrid.apply(undefined, newData);
                        }
                        var setter = data ? baseSetData : setData;
                        return setWrapToString(setter(result, newData), func, bitmask);
                    }

                    /**
                     * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
                     * of source objects to the destination object for all destination properties
                     * that resolve to `undefined`.
                     *
                     * @private
                     * @param {*} objValue The destination value.
                     * @param {*} srcValue The source value.
                     * @param {string} key The key of the property to assign.
                     * @param {Object} object The parent object of `objValue`.
                     * @returns {*} Returns the value to assign.
                     */
                    function customDefaultsAssignIn(objValue, srcValue, key, object) {
                        if (objValue === undefined ||
                            (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
                            return srcValue;
                        }
                        return objValue;
                    }

                    /**
                     * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
                     * objects into destination objects that are passed thru.
                     *
                     * @private
                     * @param {*} objValue The destination value.
                     * @param {*} srcValue The source value.
                     * @param {string} key The key of the property to merge.
                     * @param {Object} object The parent object of `objValue`.
                     * @param {Object} source The parent object of `srcValue`.
                     * @param {Object} [stack] Tracks traversed source values and their merged
                     *  counterparts.
                     * @returns {*} Returns the value to assign.
                     */
                    function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
                        if (isObject(objValue) && isObject(srcValue)) {
                            // Recursively merge objects and arrays (susceptible to call stack limits).
                            stack.set(srcValue, objValue);
                            baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
                            stack['delete'](srcValue);
                        }
                        return objValue;
                    }

                    /**
                     * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
                     * objects.
                     *
                     * @private
                     * @param {*} value The value to inspect.
                     * @param {string} key The key of the property to inspect.
                     * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
                     */
                    function customOmitClone(value) {
                        return isPlainObject(value) ? undefined : value;
                    }

                    /**
                     * A specialized version of `baseIsEqualDeep` for arrays with support for
                     * partial deep comparisons.
                     *
                     * @private
                     * @param {Array} array The array to compare.
                     * @param {Array} other The other array to compare.
                     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
                     * @param {Function} customizer The function to customize comparisons.
                     * @param {Function} equalFunc The function to determine equivalents of values.
                     * @param {Object} stack Tracks traversed `array` and `other` objects.
                     * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
                     */
                    function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
                        var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
                            arrLength = array.length,
                            othLength = other.length;

                        if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
                            return false;
                        }
                        // Assume cyclic values are equal.
                        var stacked = stack.get(array);
                        if (stacked && stack.get(other)) {
                            return stacked == other;
                        }
                        var index = -1,
                            result = true,
                            seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;

                        stack.set(array, other);
                        stack.set(other, array);

                        // Ignore non-index properties.
                        while (++index < arrLength) {
                            var arrValue = array[index],
                                othValue = other[index];

                            if (customizer) {
                                var compared = isPartial
                                    ? customizer(othValue, arrValue, index, other, array, stack)
                                    : customizer(arrValue, othValue, index, array, other, stack);
                            }
                            if (compared !== undefined) {
                                if (compared) {
                                    continue;
                                }
                                result = false;
                                break;
                            }
                            // Recursively compare arrays (susceptible to call stack limits).
                            if (seen) {
                                if (!arraySome(other, function(othValue, othIndex) {
                                        if (!cacheHas(seen, othIndex) &&
                                            (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
                                            return seen.push(othIndex);
                                        }
                                    })) {
                                    result = false;
                                    break;
                                }
                            } else if (!(
                                    arrValue === othValue ||
                                    equalFunc(arrValue, othValue, bitmask, customizer, stack)
                                )) {
                                result = false;
                                break;
                            }
                        }
                        stack['delete'](array);
                        stack['delete'](other);
                        return result;
                    }

                    /**
                     * A specialized version of `baseIsEqualDeep` for comparing objects of
                     * the same `toStringTag`.
                     *
                     * **Note:** This function only supports comparing values with tags of
                     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
                     *
                     * @private
                     * @param {Object} object The object to compare.
                     * @param {Object} other The other object to compare.
                     * @param {string} tag The `toStringTag` of the objects to compare.
                     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
                     * @param {Function} customizer The function to customize comparisons.
                     * @param {Function} equalFunc The function to determine equivalents of values.
                     * @param {Object} stack Tracks traversed `object` and `other` objects.
                     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
                     */
                    function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
                        switch (tag) {
                            case dataViewTag:
                                if ((object.byteLength != other.byteLength) ||
                                    (object.byteOffset != other.byteOffset)) {
                                    return false;
                                }
                                object = object.buffer;
                                other = other.buffer;

                            case arrayBufferTag:
                                if ((object.byteLength != other.byteLength) ||
                                    !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
                                    return false;
                                }
                                return true;

                            case boolTag:
                            case dateTag:
                            case numberTag:
                                // Coerce booleans to `1` or `0` and dates to milliseconds.
                                // Invalid dates are coerced to `NaN`.
                                return eq(+object, +other);

                            case errorTag:
                                return object.name == other.name && object.message == other.message;

                            case regexpTag:
                            case stringTag:
                                // Coerce regexes to strings and treat strings, primitives and objects,
                                // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
                                // for more details.
                                return object == (other + '');

                            case mapTag:
                                var convert = mapToArray;

                            case setTag:
                                var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
                                convert || (convert = setToArray);

                                if (object.size != other.size && !isPartial) {
                                    return false;
                                }
                                // Assume cyclic values are equal.
                                var stacked = stack.get(object);
                                if (stacked) {
                                    return stacked == other;
                                }
                                bitmask |= COMPARE_UNORDERED_FLAG;

                                // Recursively compare objects (susceptible to call stack limits).
                                stack.set(object, other);
                                var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
                                stack['delete'](object);
                                return result;

                            case symbolTag:
                                if (symbolValueOf) {
                                    return symbolValueOf.call(object) == symbolValueOf.call(other);
                                }
                        }
                        return false;
                    }

                    /**
                     * A specialized version of `baseIsEqualDeep` for objects with support for
                     * partial deep comparisons.
                     *
                     * @private
                     * @param {Object} object The object to compare.
                     * @param {Object} other The other object to compare.
                     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
                     * @param {Function} customizer The function to customize comparisons.
                     * @param {Function} equalFunc The function to determine equivalents of values.
                     * @param {Object} stack Tracks traversed `object` and `other` objects.
                     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
                     */
                    function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
                        var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
                            objProps = getAllKeys(object),
                            objLength = objProps.length,
                            othProps = getAllKeys(other),
                            othLength = othProps.length;

                        if (objLength != othLength && !isPartial) {
                            return false;
                        }
                        var index = objLength;
                        while (index--) {
                            var key = objProps[index];
                            if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
                                return false;
                            }
                        }
                        // Assume cyclic values are equal.
                        var stacked = stack.get(object);
                        if (stacked && stack.get(other)) {
                            return stacked == other;
                        }
                        var result = true;
                        stack.set(object, other);
                        stack.set(other, object);

                        var skipCtor = isPartial;
                        while (++index < objLength) {
                            key = objProps[index];
                            var objValue = object[key],
                                othValue = other[key];

                            if (customizer) {
                                var compared = isPartial
                                    ? customizer(othValue, objValue, key, other, object, stack)
                                    : customizer(objValue, othValue, key, object, other, stack);
                            }
                            // Recursively compare objects (susceptible to call stack limits).
                            if (!(compared === undefined
                                        ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
                                        : compared
                                )) {
                                result = false;
                                break;
                            }
                            skipCtor || (skipCtor = key == 'constructor');
                        }
                        if (result && !skipCtor) {
                            var objCtor = object.constructor,
                                othCtor = other.constructor;

                            // Non `Object` object instances with different constructors are not equal.
                            if (objCtor != othCtor &&
                                ('constructor' in object && 'constructor' in other) &&
                                !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
                                    typeof othCtor == 'function' && othCtor instanceof othCtor)) {
                                result = false;
                            }
                        }
                        stack['delete'](object);
                        stack['delete'](other);
                        return result;
                    }

                    /**
                     * A specialized version of `baseRest` which flattens the rest array.
                     *
                     * @private
                     * @param {Function} func The function to apply a rest parameter to.
                     * @returns {Function} Returns the new function.
                     */
                    function flatRest(func) {
                        return setToString(overRest(func, undefined, flatten), func + '');
                    }

                    /**
                     * Creates an array of own enumerable property names and symbols of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property names and symbols.
                     */
                    function getAllKeys(object) {
                        return baseGetAllKeys(object, keys, getSymbols);
                    }

                    /**
                     * Creates an array of own and inherited enumerable property names and
                     * symbols of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property names and symbols.
                     */
                    function getAllKeysIn(object) {
                        return baseGetAllKeys(object, keysIn, getSymbolsIn);
                    }

                    /**
                     * Gets metadata for `func`.
                     *
                     * @private
                     * @param {Function} func The function to query.
                     * @returns {*} Returns the metadata for `func`.
                     */
                    var getData = !metaMap ? noop : function(func) {
                        return metaMap.get(func);
                    };

                    /**
                     * Gets the name of `func`.
                     *
                     * @private
                     * @param {Function} func The function to query.
                     * @returns {string} Returns the function name.
                     */
                    function getFuncName(func) {
                        var result = (func.name + ''),
                            array = realNames[result],
                            length = hasOwnProperty.call(realNames, result) ? array.length : 0;

                        while (length--) {
                            var data = array[length],
                                otherFunc = data.func;
                            if (otherFunc == null || otherFunc == func) {
                                return data.name;
                            }
                        }
                        return result;
                    }

                    /**
                     * Gets the argument placeholder value for `func`.
                     *
                     * @private
                     * @param {Function} func The function to inspect.
                     * @returns {*} Returns the placeholder value.
                     */
                    function getHolder(func) {
                        var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
                        return object.placeholder;
                    }

                    /**
                     * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
                     * this function returns the custom method, otherwise it returns `baseIteratee`.
                     * If arguments are provided, the chosen function is invoked with them and
                     * its result is returned.
                     *
                     * @private
                     * @param {*} [value] The value to convert to an iteratee.
                     * @param {number} [arity] The arity of the created iteratee.
                     * @returns {Function} Returns the chosen function or its result.
                     */
                    function getIteratee() {
                        var result = lodash.iteratee || iteratee;
                        result = result === iteratee ? baseIteratee : result;
                        return arguments.length ? result(arguments[0], arguments[1]) : result;
                    }

                    /**
                     * Gets the data for `map`.
                     *
                     * @private
                     * @param {Object} map The map to query.
                     * @param {string} key The reference key.
                     * @returns {*} Returns the map data.
                     */
                    function getMapData(map, key) {
                        var data = map.__data__;
                        return isKeyable(key)
                            ? data[typeof key == 'string' ? 'string' : 'hash']
                            : data.map;
                    }

                    /**
                     * Gets the property names, values, and compare flags of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the match data of `object`.
                     */
                    function getMatchData(object) {
                        var result = keys(object),
                            length = result.length;

                        while (length--) {
                            var key = result[length],
                                value = object[key];

                            result[length] = [key, value, isStrictComparable(value)];
                        }
                        return result;
                    }

                    /**
                     * Gets the native function at `key` of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @param {string} key The key of the method to get.
                     * @returns {*} Returns the function if it's native, else `undefined`.
                     */
                    function getNative(object, key) {
                        var value = getValue(object, key);
                        return baseIsNative(value) ? value : undefined;
                    }

                    /**
                     * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
                     *
                     * @private
                     * @param {*} value The value to query.
                     * @returns {string} Returns the raw `toStringTag`.
                     */
                    function getRawTag(value) {
                        var isOwn = hasOwnProperty.call(value, symToStringTag),
                            tag = value[symToStringTag];

                        try {
                            value[symToStringTag] = undefined;
                            var unmasked = true;
                        } catch (e) {}

                        var result = nativeObjectToString.call(value);
                        if (unmasked) {
                            if (isOwn) {
                                value[symToStringTag] = tag;
                            } else {
                                delete value[symToStringTag];
                            }
                        }
                        return result;
                    }

                    /**
                     * Creates an array of the own enumerable symbols of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of symbols.
                     */
                    var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
                        if (object == null) {
                            return [];
                        }
                        object = Object(object);
                        return arrayFilter(nativeGetSymbols(object), function(symbol) {
                            return propertyIsEnumerable.call(object, symbol);
                        });
                    };

                    /**
                     * Creates an array of the own and inherited enumerable symbols of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of symbols.
                     */
                    var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
                        var result = [];
                        while (object) {
                            arrayPush(result, getSymbols(object));
                            object = getPrototype(object);
                        }
                        return result;
                    };

                    /**
                     * Gets the `toStringTag` of `value`.
                     *
                     * @private
                     * @param {*} value The value to query.
                     * @returns {string} Returns the `toStringTag`.
                     */
                    var getTag = baseGetTag;

                    // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
                    if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
                        (Map && getTag(new Map) != mapTag) ||
                        (Promise && getTag(Promise.resolve()) != promiseTag) ||
                        (Set && getTag(new Set) != setTag) ||
                        (WeakMap && getTag(new WeakMap) != weakMapTag)) {
                        getTag = function(value) {
                            var result = baseGetTag(value),
                                Ctor = result == objectTag ? value.constructor : undefined,
                                ctorString = Ctor ? toSource(Ctor) : '';

                            if (ctorString) {
                                switch (ctorString) {
                                    case dataViewCtorString: return dataViewTag;
                                    case mapCtorString: return mapTag;
                                    case promiseCtorString: return promiseTag;
                                    case setCtorString: return setTag;
                                    case weakMapCtorString: return weakMapTag;
                                }
                            }
                            return result;
                        };
                    }

                    /**
                     * Gets the view, applying any `transforms` to the `start` and `end` positions.
                     *
                     * @private
                     * @param {number} start The start of the view.
                     * @param {number} end The end of the view.
                     * @param {Array} transforms The transformations to apply to the view.
                     * @returns {Object} Returns an object containing the `start` and `end`
                     *  positions of the view.
                     */
                    function getView(start, end, transforms) {
                        var index = -1,
                            length = transforms.length;

                        while (++index < length) {
                            var data = transforms[index],
                                size = data.size;

                            switch (data.type) {
                                case 'drop':      start += size; break;
                                case 'dropRight': end -= size; break;
                                case 'take':      end = nativeMin(end, start + size); break;
                                case 'takeRight': start = nativeMax(start, end - size); break;
                            }
                        }
                        return { 'start': start, 'end': end };
                    }

                    /**
                     * Extracts wrapper details from the `source` body comment.
                     *
                     * @private
                     * @param {string} source The source to inspect.
                     * @returns {Array} Returns the wrapper details.
                     */
                    function getWrapDetails(source) {
                        var match = source.match(reWrapDetails);
                        return match ? match[1].split(reSplitDetails) : [];
                    }

                    /**
                     * Checks if `path` exists on `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path to check.
                     * @param {Function} hasFunc The function to check properties.
                     * @returns {boolean} Returns `true` if `path` exists, else `false`.
                     */
                    function hasPath(object, path, hasFunc) {
                        path = castPath(path, object);

                        var index = -1,
                            length = path.length,
                            result = false;

                        while (++index < length) {
                            var key = toKey(path[index]);
                            if (!(result = object != null && hasFunc(object, key))) {
                                break;
                            }
                            object = object[key];
                        }
                        if (result || ++index != length) {
                            return result;
                        }
                        length = object == null ? 0 : object.length;
                        return !!length && isLength(length) && isIndex(key, length) &&
                            (isArray(object) || isArguments(object));
                    }

                    /**
                     * Initializes an array clone.
                     *
                     * @private
                     * @param {Array} array The array to clone.
                     * @returns {Array} Returns the initialized clone.
                     */
                    function initCloneArray(array) {
                        var length = array.length,
                            result = array.constructor(length);

                        // Add properties assigned by `RegExp#exec`.
                        if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
                            result.index = array.index;
                            result.input = array.input;
                        }
                        return result;
                    }

                    /**
                     * Initializes an object clone.
                     *
                     * @private
                     * @param {Object} object The object to clone.
                     * @returns {Object} Returns the initialized clone.
                     */
                    function initCloneObject(object) {
                        return (typeof object.constructor == 'function' && !isPrototype(object))
                            ? baseCreate(getPrototype(object))
                            : {};
                    }

                    /**
                     * Initializes an object clone based on its `toStringTag`.
                     *
                     * **Note:** This function only supports cloning values with tags of
                     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
                     *
                     * @private
                     * @param {Object} object The object to clone.
                     * @param {string} tag The `toStringTag` of the object to clone.
                     * @param {Function} cloneFunc The function to clone values.
                     * @param {boolean} [isDeep] Specify a deep clone.
                     * @returns {Object} Returns the initialized clone.
                     */
                    function initCloneByTag(object, tag, cloneFunc, isDeep) {
                        var Ctor = object.constructor;
                        switch (tag) {
                            case arrayBufferTag:
                                return cloneArrayBuffer(object);

                            case boolTag:
                            case dateTag:
                                return new Ctor(+object);

                            case dataViewTag:
                                return cloneDataView(object, isDeep);

                            case float32Tag: case float64Tag:
                            case int8Tag: case int16Tag: case int32Tag:
                            case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
                            return cloneTypedArray(object, isDeep);

                            case mapTag:
                                return cloneMap(object, isDeep, cloneFunc);

                            case numberTag:
                            case stringTag:
                                return new Ctor(object);

                            case regexpTag:
                                return cloneRegExp(object);

                            case setTag:
                                return cloneSet(object, isDeep, cloneFunc);

                            case symbolTag:
                                return cloneSymbol(object);
                        }
                    }

                    /**
                     * Inserts wrapper `details` in a comment at the top of the `source` body.
                     *
                     * @private
                     * @param {string} source The source to modify.
                     * @returns {Array} details The details to insert.
                     * @returns {string} Returns the modified source.
                     */
                    function insertWrapDetails(source, details) {
                        var length = details.length;
                        if (!length) {
                            return source;
                        }
                        var lastIndex = length - 1;
                        details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
                        details = details.join(length > 2 ? ', ' : ' ');
                        return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
                    }

                    /**
                     * Checks if `value` is a flattenable `arguments` object or array.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
                     */
                    function isFlattenable(value) {
                        return isArray(value) || isArguments(value) ||
                            !!(spreadableSymbol && value && value[spreadableSymbol]);
                    }

                    /**
                     * Checks if `value` is a valid array-like index.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
                     * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
                     */
                    function isIndex(value, length) {
                        length = length == null ? MAX_SAFE_INTEGER : length;
                        return !!length &&
                            (typeof value == 'number' || reIsUint.test(value)) &&
                            (value > -1 && value % 1 == 0 && value < length);
                    }

                    /**
                     * Checks if the given arguments are from an iteratee call.
                     *
                     * @private
                     * @param {*} value The potential iteratee value argument.
                     * @param {*} index The potential iteratee index or key argument.
                     * @param {*} object The potential iteratee object argument.
                     * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
                     *  else `false`.
                     */
                    function isIterateeCall(value, index, object) {
                        if (!isObject(object)) {
                            return false;
                        }
                        var type = typeof index;
                        if (type == 'number'
                                ? (isArrayLike(object) && isIndex(index, object.length))
                                : (type == 'string' && index in object)
                        ) {
                            return eq(object[index], value);
                        }
                        return false;
                    }

                    /**
                     * Checks if `value` is a property name and not a property path.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @param {Object} [object] The object to query keys on.
                     * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
                     */
                    function isKey(value, object) {
                        if (isArray(value)) {
                            return false;
                        }
                        var type = typeof value;
                        if (type == 'number' || type == 'symbol' || type == 'boolean' ||
                            value == null || isSymbol(value)) {
                            return true;
                        }
                        return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
                            (object != null && value in Object(object));
                    }

                    /**
                     * Checks if `value` is suitable for use as unique object key.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
                     */
                    function isKeyable(value) {
                        var type = typeof value;
                        return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
                            ? (value !== '__proto__')
                            : (value === null);
                    }

                    /**
                     * Checks if `func` has a lazy counterpart.
                     *
                     * @private
                     * @param {Function} func The function to check.
                     * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
                     *  else `false`.
                     */
                    function isLaziable(func) {
                        var funcName = getFuncName(func),
                            other = lodash[funcName];

                        if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
                            return false;
                        }
                        if (func === other) {
                            return true;
                        }
                        var data = getData(other);
                        return !!data && func === data[0];
                    }

                    /**
                     * Checks if `func` has its source masked.
                     *
                     * @private
                     * @param {Function} func The function to check.
                     * @returns {boolean} Returns `true` if `func` is masked, else `false`.
                     */
                    function isMasked(func) {
                        return !!maskSrcKey && (maskSrcKey in func);
                    }

                    /**
                     * Checks if `func` is capable of being masked.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
                     */
                    var isMaskable = coreJsData ? isFunction : stubFalse;

                    /**
                     * Checks if `value` is likely a prototype object.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
                     */
                    function isPrototype(value) {
                        var Ctor = value && value.constructor,
                            proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;

                        return value === proto;
                    }

                    /**
                     * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
                     *
                     * @private
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` if suitable for strict
                     *  equality comparisons, else `false`.
                     */
                    function isStrictComparable(value) {
                        return value === value && !isObject(value);
                    }

                    /**
                     * A specialized version of `matchesProperty` for source values suitable
                     * for strict equality comparisons, i.e. `===`.
                     *
                     * @private
                     * @param {string} key The key of the property to get.
                     * @param {*} srcValue The value to match.
                     * @returns {Function} Returns the new spec function.
                     */
                    function matchesStrictComparable(key, srcValue) {
                        return function(object) {
                            if (object == null) {
                                return false;
                            }
                            return object[key] === srcValue &&
                                (srcValue !== undefined || (key in Object(object)));
                        };
                    }

                    /**
                     * A specialized version of `_.memoize` which clears the memoized function's
                     * cache when it exceeds `MAX_MEMOIZE_SIZE`.
                     *
                     * @private
                     * @param {Function} func The function to have its output memoized.
                     * @returns {Function} Returns the new memoized function.
                     */
                    function memoizeCapped(func) {
                        var result = memoize(func, function(key) {
                            if (cache.size === MAX_MEMOIZE_SIZE) {
                                cache.clear();
                            }
                            return key;
                        });

                        var cache = result.cache;
                        return result;
                    }

                    /**
                     * Merges the function metadata of `source` into `data`.
                     *
                     * Merging metadata reduces the number of wrappers used to invoke a function.
                     * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
                     * may be applied regardless of execution order. Methods like `_.ary` and
                     * `_.rearg` modify function arguments, making the order in which they are
                     * executed important, preventing the merging of metadata. However, we make
                     * an exception for a safe combined case where curried functions have `_.ary`
                     * and or `_.rearg` applied.
                     *
                     * @private
                     * @param {Array} data The destination metadata.
                     * @param {Array} source The source metadata.
                     * @returns {Array} Returns `data`.
                     */
                    function mergeData(data, source) {
                        var bitmask = data[1],
                            srcBitmask = source[1],
                            newBitmask = bitmask | srcBitmask,
                            isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);

                        var isCombo =
                            ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
                            ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
                            ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));

                        // Exit early if metadata can't be merged.
                        if (!(isCommon || isCombo)) {
                            return data;
                        }
                        // Use source `thisArg` if available.
                        if (srcBitmask & WRAP_BIND_FLAG) {
                            data[2] = source[2];
                            // Set when currying a bound function.
                            newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
                        }
                        // Compose partial arguments.
                        var value = source[3];
                        if (value) {
                            var partials = data[3];
                            data[3] = partials ? composeArgs(partials, value, source[4]) : value;
                            data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
                        }
                        // Compose partial right arguments.
                        value = source[5];
                        if (value) {
                            partials = data[5];
                            data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
                            data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
                        }
                        // Use source `argPos` if available.
                        value = source[7];
                        if (value) {
                            data[7] = value;
                        }
                        // Use source `ary` if it's smaller.
                        if (srcBitmask & WRAP_ARY_FLAG) {
                            data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
                        }
                        // Use source `arity` if one is not provided.
                        if (data[9] == null) {
                            data[9] = source[9];
                        }
                        // Use source `func` and merge bitmasks.
                        data[0] = source[0];
                        data[1] = newBitmask;

                        return data;
                    }

                    /**
                     * This function is like
                     * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
                     * except that it includes inherited enumerable properties.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property names.
                     */
                    function nativeKeysIn(object) {
                        var result = [];
                        if (object != null) {
                            for (var key in Object(object)) {
                                result.push(key);
                            }
                        }
                        return result;
                    }

                    /**
                     * Converts `value` to a string using `Object.prototype.toString`.
                     *
                     * @private
                     * @param {*} value The value to convert.
                     * @returns {string} Returns the converted string.
                     */
                    function objectToString(value) {
                        return nativeObjectToString.call(value);
                    }

                    /**
                     * A specialized version of `baseRest` which transforms the rest array.
                     *
                     * @private
                     * @param {Function} func The function to apply a rest parameter to.
                     * @param {number} [start=func.length-1] The start position of the rest parameter.
                     * @param {Function} transform The rest array transform.
                     * @returns {Function} Returns the new function.
                     */
                    function overRest(func, start, transform) {
                        start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
                        return function() {
                            var args = arguments,
                                index = -1,
                                length = nativeMax(args.length - start, 0),
                                array = Array(length);

                            while (++index < length) {
                                array[index] = args[start + index];
                            }
                            index = -1;
                            var otherArgs = Array(start + 1);
                            while (++index < start) {
                                otherArgs[index] = args[index];
                            }
                            otherArgs[start] = transform(array);
                            return apply(func, this, otherArgs);
                        };
                    }

                    /**
                     * Gets the parent value at `path` of `object`.
                     *
                     * @private
                     * @param {Object} object The object to query.
                     * @param {Array} path The path to get the parent value of.
                     * @returns {*} Returns the parent value.
                     */
                    function parent(object, path) {
                        return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
                    }

                    /**
                     * Reorder `array` according to the specified indexes where the element at
                     * the first index is assigned as the first element, the element at
                     * the second index is assigned as the second element, and so on.
                     *
                     * @private
                     * @param {Array} array The array to reorder.
                     * @param {Array} indexes The arranged array indexes.
                     * @returns {Array} Returns `array`.
                     */
                    function reorder(array, indexes) {
                        var arrLength = array.length,
                            length = nativeMin(indexes.length, arrLength),
                            oldArray = copyArray(array);

                        while (length--) {
                            var index = indexes[length];
                            array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
                        }
                        return array;
                    }

                    /**
                     * Sets metadata for `func`.
                     *
                     * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
                     * period of time, it will trip its breaker and transition to an identity
                     * function to avoid garbage collection pauses in V8. See
                     * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
                     * for more details.
                     *
                     * @private
                     * @param {Function} func The function to associate metadata with.
                     * @param {*} data The metadata.
                     * @returns {Function} Returns `func`.
                     */
                    var setData = shortOut(baseSetData);

                    /**
                     * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
                     *
                     * @private
                     * @param {Function} func The function to delay.
                     * @param {number} wait The number of milliseconds to delay invocation.
                     * @returns {number|Object} Returns the timer id or timeout object.
                     */
                    var setTimeout = ctxSetTimeout || function(func, wait) {
                        return root.setTimeout(func, wait);
                    };

                    /**
                     * Sets the `toString` method of `func` to return `string`.
                     *
                     * @private
                     * @param {Function} func The function to modify.
                     * @param {Function} string The `toString` result.
                     * @returns {Function} Returns `func`.
                     */
                    var setToString = shortOut(baseSetToString);

                    /**
                     * Sets the `toString` method of `wrapper` to mimic the source of `reference`
                     * with wrapper details in a comment at the top of the source body.
                     *
                     * @private
                     * @param {Function} wrapper The function to modify.
                     * @param {Function} reference The reference function.
                     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
                     * @returns {Function} Returns `wrapper`.
                     */
                    function setWrapToString(wrapper, reference, bitmask) {
                        var source = (reference + '');
                        return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
                    }

                    /**
                     * Creates a function that'll short out and invoke `identity` instead
                     * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
                     * milliseconds.
                     *
                     * @private
                     * @param {Function} func The function to restrict.
                     * @returns {Function} Returns the new shortable function.
                     */
                    function shortOut(func) {
                        var count = 0,
                            lastCalled = 0;

                        return function() {
                            var stamp = nativeNow(),
                                remaining = HOT_SPAN - (stamp - lastCalled);

                            lastCalled = stamp;
                            if (remaining > 0) {
                                if (++count >= HOT_COUNT) {
                                    return arguments[0];
                                }
                            } else {
                                count = 0;
                            }
                            return func.apply(undefined, arguments);
                        };
                    }

                    /**
                     * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
                     *
                     * @private
                     * @param {Array} array The array to shuffle.
                     * @param {number} [size=array.length] The size of `array`.
                     * @returns {Array} Returns `array`.
                     */
                    function shuffleSelf(array, size) {
                        var index = -1,
                            length = array.length,
                            lastIndex = length - 1;

                        size = size === undefined ? length : size;
                        while (++index < size) {
                            var rand = baseRandom(index, lastIndex),
                                value = array[rand];

                            array[rand] = array[index];
                            array[index] = value;
                        }
                        array.length = size;
                        return array;
                    }

                    /**
                     * Converts `string` to a property path array.
                     *
                     * @private
                     * @param {string} string The string to convert.
                     * @returns {Array} Returns the property path array.
                     */
                    var stringToPath = memoizeCapped(function(string) {
                        var result = [];
                        if (reLeadingDot.test(string)) {
                            result.push('');
                        }
                        string.replace(rePropName, function(match, number, quote, string) {
                            result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
                        });
                        return result;
                    });

                    /**
                     * Converts `value` to a string key if it's not a string or symbol.
                     *
                     * @private
                     * @param {*} value The value to inspect.
                     * @returns {string|symbol} Returns the key.
                     */
                    function toKey(value) {
                        if (typeof value == 'string' || isSymbol(value)) {
                            return value;
                        }
                        var result = (value + '');
                        return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
                    }

                    /**
                     * Converts `func` to its source code.
                     *
                     * @private
                     * @param {Function} func The function to convert.
                     * @returns {string} Returns the source code.
                     */
                    function toSource(func) {
                        if (func != null) {
                            try {
                                return funcToString.call(func);
                            } catch (e) {}
                            try {
                                return (func + '');
                            } catch (e) {}
                        }
                        return '';
                    }

                    /**
                     * Updates wrapper `details` based on `bitmask` flags.
                     *
                     * @private
                     * @returns {Array} details The details to modify.
                     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
                     * @returns {Array} Returns `details`.
                     */
                    function updateWrapDetails(details, bitmask) {
                        arrayEach(wrapFlags, function(pair) {
                            var value = '_.' + pair[0];
                            if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
                                details.push(value);
                            }
                        });
                        return details.sort();
                    }

                    /**
                     * Creates a clone of `wrapper`.
                     *
                     * @private
                     * @param {Object} wrapper The wrapper to clone.
                     * @returns {Object} Returns the cloned wrapper.
                     */
                    function wrapperClone(wrapper) {
                        if (wrapper instanceof LazyWrapper) {
                            return wrapper.clone();
                        }
                        var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
                        result.__actions__ = copyArray(wrapper.__actions__);
                        result.__index__  = wrapper.__index__;
                        result.__values__ = wrapper.__values__;
                        return result;
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates an array of elements split into groups the length of `size`.
                     * If `array` can't be split evenly, the final chunk will be the remaining
                     * elements.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to process.
                     * @param {number} [size=1] The length of each chunk
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Array} Returns the new array of chunks.
                     * @example
                     *
                     * _.chunk(['a', 'b', 'c', 'd'], 2);
                     * // => [['a', 'b'], ['c', 'd']]
                     *
                     * _.chunk(['a', 'b', 'c', 'd'], 3);
                     * // => [['a', 'b', 'c'], ['d']]
                     */
                    function chunk(array, size, guard) {
                        if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
                            size = 1;
                        } else {
                            size = nativeMax(toInteger(size), 0);
                        }
                        var length = array == null ? 0 : array.length;
                        if (!length || size < 1) {
                            return [];
                        }
                        var index = 0,
                            resIndex = 0,
                            result = Array(nativeCeil(length / size));

                        while (index < length) {
                            result[resIndex++] = baseSlice(array, index, (index += size));
                        }
                        return result;
                    }

                    /**
                     * Creates an array with all falsey values removed. The values `false`, `null`,
                     * `0`, `""`, `undefined`, and `NaN` are falsey.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to compact.
                     * @returns {Array} Returns the new array of filtered values.
                     * @example
                     *
                     * _.compact([0, 1, false, 2, '', 3]);
                     * // => [1, 2, 3]
                     */
                    function compact(array) {
                        var index = -1,
                            length = array == null ? 0 : array.length,
                            resIndex = 0,
                            result = [];

                        while (++index < length) {
                            var value = array[index];
                            if (value) {
                                result[resIndex++] = value;
                            }
                        }
                        return result;
                    }

                    /**
                     * Creates a new array concatenating `array` with any additional arrays
                     * and/or values.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to concatenate.
                     * @param {...*} [values] The values to concatenate.
                     * @returns {Array} Returns the new concatenated array.
                     * @example
                     *
                     * var array = [1];
                     * var other = _.concat(array, 2, [3], [[4]]);
                     *
                     * console.log(other);
                     * // => [1, 2, 3, [4]]
                     *
                     * console.log(array);
                     * // => [1]
                     */
                    function concat() {
                        var length = arguments.length;
                        if (!length) {
                            return [];
                        }
                        var args = Array(length - 1),
                            array = arguments[0],
                            index = length;

                        while (index--) {
                            args[index - 1] = arguments[index];
                        }
                        return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
                    }

                    /**
                     * Creates an array of `array` values not included in the other given arrays
                     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons. The order and references of result values are
                     * determined by the first array.
                     *
                     * **Note:** Unlike `_.pullAll`, this method returns a new array.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {...Array} [values] The values to exclude.
                     * @returns {Array} Returns the new array of filtered values.
                     * @see _.without, _.xor
                     * @example
                     *
                     * _.difference([2, 1], [2, 3]);
                     * // => [1]
                     */
                    var difference = baseRest(function(array, values) {
                        return isArrayLikeObject(array)
                            ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
                            : [];
                    });

                    /**
                     * This method is like `_.difference` except that it accepts `iteratee` which
                     * is invoked for each element of `array` and `values` to generate the criterion
                     * by which they're compared. The order and references of result values are
                     * determined by the first array. The iteratee is invoked with one argument:
                     * (value).
                     *
                     * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {...Array} [values] The values to exclude.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {Array} Returns the new array of filtered values.
                     * @example
                     *
                     * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
                     * // => [1.2]
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
                     * // => [{ 'x': 2 }]
                     */
                    var differenceBy = baseRest(function(array, values) {
                        var iteratee = last(values);
                        if (isArrayLikeObject(iteratee)) {
                            iteratee = undefined;
                        }
                        return isArrayLikeObject(array)
                            ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
                            : [];
                    });

                    /**
                     * This method is like `_.difference` except that it accepts `comparator`
                     * which is invoked to compare elements of `array` to `values`. The order and
                     * references of result values are determined by the first array. The comparator
                     * is invoked with two arguments: (arrVal, othVal).
                     *
                     * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {...Array} [values] The values to exclude.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new array of filtered values.
                     * @example
                     *
                     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
                     *
                     * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
                     * // => [{ 'x': 2, 'y': 1 }]
                     */
                    var differenceWith = baseRest(function(array, values) {
                        var comparator = last(values);
                        if (isArrayLikeObject(comparator)) {
                            comparator = undefined;
                        }
                        return isArrayLikeObject(array)
                            ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
                            : [];
                    });

                    /**
                     * Creates a slice of `array` with `n` elements dropped from the beginning.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.5.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {number} [n=1] The number of elements to drop.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * _.drop([1, 2, 3]);
                     * // => [2, 3]
                     *
                     * _.drop([1, 2, 3], 2);
                     * // => [3]
                     *
                     * _.drop([1, 2, 3], 5);
                     * // => []
                     *
                     * _.drop([1, 2, 3], 0);
                     * // => [1, 2, 3]
                     */
                    function drop(array, n, guard) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return [];
                        }
                        n = (guard || n === undefined) ? 1 : toInteger(n);
                        return baseSlice(array, n < 0 ? 0 : n, length);
                    }

                    /**
                     * Creates a slice of `array` with `n` elements dropped from the end.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {number} [n=1] The number of elements to drop.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * _.dropRight([1, 2, 3]);
                     * // => [1, 2]
                     *
                     * _.dropRight([1, 2, 3], 2);
                     * // => [1]
                     *
                     * _.dropRight([1, 2, 3], 5);
                     * // => []
                     *
                     * _.dropRight([1, 2, 3], 0);
                     * // => [1, 2, 3]
                     */
                    function dropRight(array, n, guard) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return [];
                        }
                        n = (guard || n === undefined) ? 1 : toInteger(n);
                        n = length - n;
                        return baseSlice(array, 0, n < 0 ? 0 : n);
                    }

                    /**
                     * Creates a slice of `array` excluding elements dropped from the end.
                     * Elements are dropped until `predicate` returns falsey. The predicate is
                     * invoked with three arguments: (value, index, array).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'active': true },
                     *   { 'user': 'fred',    'active': false },
                     *   { 'user': 'pebbles', 'active': false }
                     * ];
                     *
                     * _.dropRightWhile(users, function(o) { return !o.active; });
                     * // => objects for ['barney']
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
                     * // => objects for ['barney', 'fred']
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.dropRightWhile(users, ['active', false]);
                     * // => objects for ['barney']
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.dropRightWhile(users, 'active');
                     * // => objects for ['barney', 'fred', 'pebbles']
                     */
                    function dropRightWhile(array, predicate) {
                        return (array && array.length)
                            ? baseWhile(array, getIteratee(predicate, 3), true, true)
                            : [];
                    }

                    /**
                     * Creates a slice of `array` excluding elements dropped from the beginning.
                     * Elements are dropped until `predicate` returns falsey. The predicate is
                     * invoked with three arguments: (value, index, array).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'active': false },
                     *   { 'user': 'fred',    'active': false },
                     *   { 'user': 'pebbles', 'active': true }
                     * ];
                     *
                     * _.dropWhile(users, function(o) { return !o.active; });
                     * // => objects for ['pebbles']
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.dropWhile(users, { 'user': 'barney', 'active': false });
                     * // => objects for ['fred', 'pebbles']
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.dropWhile(users, ['active', false]);
                     * // => objects for ['pebbles']
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.dropWhile(users, 'active');
                     * // => objects for ['barney', 'fred', 'pebbles']
                     */
                    function dropWhile(array, predicate) {
                        return (array && array.length)
                            ? baseWhile(array, getIteratee(predicate, 3), true)
                            : [];
                    }

                    /**
                     * Fills elements of `array` with `value` from `start` up to, but not
                     * including, `end`.
                     *
                     * **Note:** This method mutates `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.2.0
                     * @category Array
                     * @param {Array} array The array to fill.
                     * @param {*} value The value to fill `array` with.
                     * @param {number} [start=0] The start position.
                     * @param {number} [end=array.length] The end position.
                     * @returns {Array} Returns `array`.
                     * @example
                     *
                     * var array = [1, 2, 3];
                     *
                     * _.fill(array, 'a');
                     * console.log(array);
                     * // => ['a', 'a', 'a']
                     *
                     * _.fill(Array(3), 2);
                     * // => [2, 2, 2]
                     *
                     * _.fill([4, 6, 8, 10], '*', 1, 3);
                     * // => [4, '*', '*', 10]
                     */
                    function fill(array, value, start, end) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return [];
                        }
                        if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
                            start = 0;
                            end = length;
                        }
                        return baseFill(array, value, start, end);
                    }

                    /**
                     * This method is like `_.find` except that it returns the index of the first
                     * element `predicate` returns truthy for instead of the element itself.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.1.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @param {number} [fromIndex=0] The index to search from.
                     * @returns {number} Returns the index of the found element, else `-1`.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'active': false },
                     *   { 'user': 'fred',    'active': false },
                     *   { 'user': 'pebbles', 'active': true }
                     * ];
                     *
                     * _.findIndex(users, function(o) { return o.user == 'barney'; });
                     * // => 0
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.findIndex(users, { 'user': 'fred', 'active': false });
                     * // => 1
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.findIndex(users, ['active', false]);
                     * // => 0
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.findIndex(users, 'active');
                     * // => 2
                     */
                    function findIndex(array, predicate, fromIndex) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return -1;
                        }
                        var index = fromIndex == null ? 0 : toInteger(fromIndex);
                        if (index < 0) {
                            index = nativeMax(length + index, 0);
                        }
                        return baseFindIndex(array, getIteratee(predicate, 3), index);
                    }

                    /**
                     * This method is like `_.findIndex` except that it iterates over elements
                     * of `collection` from right to left.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @param {number} [fromIndex=array.length-1] The index to search from.
                     * @returns {number} Returns the index of the found element, else `-1`.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'active': true },
                     *   { 'user': 'fred',    'active': false },
                     *   { 'user': 'pebbles', 'active': false }
                     * ];
                     *
                     * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
                     * // => 2
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.findLastIndex(users, { 'user': 'barney', 'active': true });
                     * // => 0
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.findLastIndex(users, ['active', false]);
                     * // => 2
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.findLastIndex(users, 'active');
                     * // => 0
                     */
                    function findLastIndex(array, predicate, fromIndex) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return -1;
                        }
                        var index = length - 1;
                        if (fromIndex !== undefined) {
                            index = toInteger(fromIndex);
                            index = fromIndex < 0
                                ? nativeMax(length + index, 0)
                                : nativeMin(index, length - 1);
                        }
                        return baseFindIndex(array, getIteratee(predicate, 3), index, true);
                    }

                    /**
                     * Flattens `array` a single level deep.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to flatten.
                     * @returns {Array} Returns the new flattened array.
                     * @example
                     *
                     * _.flatten([1, [2, [3, [4]], 5]]);
                     * // => [1, 2, [3, [4]], 5]
                     */
                    function flatten(array) {
                        var length = array == null ? 0 : array.length;
                        return length ? baseFlatten(array, 1) : [];
                    }

                    /**
                     * Recursively flattens `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to flatten.
                     * @returns {Array} Returns the new flattened array.
                     * @example
                     *
                     * _.flattenDeep([1, [2, [3, [4]], 5]]);
                     * // => [1, 2, 3, 4, 5]
                     */
                    function flattenDeep(array) {
                        var length = array == null ? 0 : array.length;
                        return length ? baseFlatten(array, INFINITY) : [];
                    }

                    /**
                     * Recursively flatten `array` up to `depth` times.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.4.0
                     * @category Array
                     * @param {Array} array The array to flatten.
                     * @param {number} [depth=1] The maximum recursion depth.
                     * @returns {Array} Returns the new flattened array.
                     * @example
                     *
                     * var array = [1, [2, [3, [4]], 5]];
                     *
                     * _.flattenDepth(array, 1);
                     * // => [1, 2, [3, [4]], 5]
                     *
                     * _.flattenDepth(array, 2);
                     * // => [1, 2, 3, [4], 5]
                     */
                    function flattenDepth(array, depth) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return [];
                        }
                        depth = depth === undefined ? 1 : toInteger(depth);
                        return baseFlatten(array, depth);
                    }

                    /**
                     * The inverse of `_.toPairs`; this method returns an object composed
                     * from key-value `pairs`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} pairs The key-value pairs.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * _.fromPairs([['a', 1], ['b', 2]]);
                     * // => { 'a': 1, 'b': 2 }
                     */
                    function fromPairs(pairs) {
                        var index = -1,
                            length = pairs == null ? 0 : pairs.length,
                            result = {};

                        while (++index < length) {
                            var pair = pairs[index];
                            result[pair[0]] = pair[1];
                        }
                        return result;
                    }

                    /**
                     * Gets the first element of `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @alias first
                     * @category Array
                     * @param {Array} array The array to query.
                     * @returns {*} Returns the first element of `array`.
                     * @example
                     *
                     * _.head([1, 2, 3]);
                     * // => 1
                     *
                     * _.head([]);
                     * // => undefined
                     */
                    function head(array) {
                        return (array && array.length) ? array[0] : undefined;
                    }

                    /**
                     * Gets the index at which the first occurrence of `value` is found in `array`
                     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons. If `fromIndex` is negative, it's used as the
                     * offset from the end of `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {*} value The value to search for.
                     * @param {number} [fromIndex=0] The index to search from.
                     * @returns {number} Returns the index of the matched value, else `-1`.
                     * @example
                     *
                     * _.indexOf([1, 2, 1, 2], 2);
                     * // => 1
                     *
                     * // Search from the `fromIndex`.
                     * _.indexOf([1, 2, 1, 2], 2, 2);
                     * // => 3
                     */
                    function indexOf(array, value, fromIndex) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return -1;
                        }
                        var index = fromIndex == null ? 0 : toInteger(fromIndex);
                        if (index < 0) {
                            index = nativeMax(length + index, 0);
                        }
                        return baseIndexOf(array, value, index);
                    }

                    /**
                     * Gets all but the last element of `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * _.initial([1, 2, 3]);
                     * // => [1, 2]
                     */
                    function initial(array) {
                        var length = array == null ? 0 : array.length;
                        return length ? baseSlice(array, 0, -1) : [];
                    }

                    /**
                     * Creates an array of unique values that are included in all given arrays
                     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons. The order and references of result values are
                     * determined by the first array.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @returns {Array} Returns the new array of intersecting values.
                     * @example
                     *
                     * _.intersection([2, 1], [2, 3]);
                     * // => [2]
                     */
                    var intersection = baseRest(function(arrays) {
                        var mapped = arrayMap(arrays, castArrayLikeObject);
                        return (mapped.length && mapped[0] === arrays[0])
                            ? baseIntersection(mapped)
                            : [];
                    });

                    /**
                     * This method is like `_.intersection` except that it accepts `iteratee`
                     * which is invoked for each element of each `arrays` to generate the criterion
                     * by which they're compared. The order and references of result values are
                     * determined by the first array. The iteratee is invoked with one argument:
                     * (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {Array} Returns the new array of intersecting values.
                     * @example
                     *
                     * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
                     * // => [2.1]
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
                     * // => [{ 'x': 1 }]
                     */
                    var intersectionBy = baseRest(function(arrays) {
                        var iteratee = last(arrays),
                            mapped = arrayMap(arrays, castArrayLikeObject);

                        if (iteratee === last(mapped)) {
                            iteratee = undefined;
                        } else {
                            mapped.pop();
                        }
                        return (mapped.length && mapped[0] === arrays[0])
                            ? baseIntersection(mapped, getIteratee(iteratee, 2))
                            : [];
                    });

                    /**
                     * This method is like `_.intersection` except that it accepts `comparator`
                     * which is invoked to compare elements of `arrays`. The order and references
                     * of result values are determined by the first array. The comparator is
                     * invoked with two arguments: (arrVal, othVal).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new array of intersecting values.
                     * @example
                     *
                     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
                     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
                     *
                     * _.intersectionWith(objects, others, _.isEqual);
                     * // => [{ 'x': 1, 'y': 2 }]
                     */
                    var intersectionWith = baseRest(function(arrays) {
                        var comparator = last(arrays),
                            mapped = arrayMap(arrays, castArrayLikeObject);

                        comparator = typeof comparator == 'function' ? comparator : undefined;
                        if (comparator) {
                            mapped.pop();
                        }
                        return (mapped.length && mapped[0] === arrays[0])
                            ? baseIntersection(mapped, undefined, comparator)
                            : [];
                    });

                    /**
                     * Converts all elements in `array` into a string separated by `separator`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to convert.
                     * @param {string} [separator=','] The element separator.
                     * @returns {string} Returns the joined string.
                     * @example
                     *
                     * _.join(['a', 'b', 'c'], '~');
                     * // => 'a~b~c'
                     */
                    function join(array, separator) {
                        return array == null ? '' : nativeJoin.call(array, separator);
                    }

                    /**
                     * Gets the last element of `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @returns {*} Returns the last element of `array`.
                     * @example
                     *
                     * _.last([1, 2, 3]);
                     * // => 3
                     */
                    function last(array) {
                        var length = array == null ? 0 : array.length;
                        return length ? array[length - 1] : undefined;
                    }

                    /**
                     * This method is like `_.indexOf` except that it iterates over elements of
                     * `array` from right to left.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {*} value The value to search for.
                     * @param {number} [fromIndex=array.length-1] The index to search from.
                     * @returns {number} Returns the index of the matched value, else `-1`.
                     * @example
                     *
                     * _.lastIndexOf([1, 2, 1, 2], 2);
                     * // => 3
                     *
                     * // Search from the `fromIndex`.
                     * _.lastIndexOf([1, 2, 1, 2], 2, 2);
                     * // => 1
                     */
                    function lastIndexOf(array, value, fromIndex) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return -1;
                        }
                        var index = length;
                        if (fromIndex !== undefined) {
                            index = toInteger(fromIndex);
                            index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
                        }
                        return value === value
                            ? strictLastIndexOf(array, value, index)
                            : baseFindIndex(array, baseIsNaN, index, true);
                    }

                    /**
                     * Gets the element at index `n` of `array`. If `n` is negative, the nth
                     * element from the end is returned.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.11.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {number} [n=0] The index of the element to return.
                     * @returns {*} Returns the nth element of `array`.
                     * @example
                     *
                     * var array = ['a', 'b', 'c', 'd'];
                     *
                     * _.nth(array, 1);
                     * // => 'b'
                     *
                     * _.nth(array, -2);
                     * // => 'c';
                     */
                    function nth(array, n) {
                        return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
                    }

                    /**
                     * Removes all given values from `array` using
                     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons.
                     *
                     * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
                     * to remove elements from an array by predicate.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Array
                     * @param {Array} array The array to modify.
                     * @param {...*} [values] The values to remove.
                     * @returns {Array} Returns `array`.
                     * @example
                     *
                     * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
                     *
                     * _.pull(array, 'a', 'c');
                     * console.log(array);
                     * // => ['b', 'b']
                     */
                    var pull = baseRest(pullAll);

                    /**
                     * This method is like `_.pull` except that it accepts an array of values to remove.
                     *
                     * **Note:** Unlike `_.difference`, this method mutates `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to modify.
                     * @param {Array} values The values to remove.
                     * @returns {Array} Returns `array`.
                     * @example
                     *
                     * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
                     *
                     * _.pullAll(array, ['a', 'c']);
                     * console.log(array);
                     * // => ['b', 'b']
                     */
                    function pullAll(array, values) {
                        return (array && array.length && values && values.length)
                            ? basePullAll(array, values)
                            : array;
                    }

                    /**
                     * This method is like `_.pullAll` except that it accepts `iteratee` which is
                     * invoked for each element of `array` and `values` to generate the criterion
                     * by which they're compared. The iteratee is invoked with one argument: (value).
                     *
                     * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to modify.
                     * @param {Array} values The values to remove.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {Array} Returns `array`.
                     * @example
                     *
                     * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
                     *
                     * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
                     * console.log(array);
                     * // => [{ 'x': 2 }]
                     */
                    function pullAllBy(array, values, iteratee) {
                        return (array && array.length && values && values.length)
                            ? basePullAll(array, values, getIteratee(iteratee, 2))
                            : array;
                    }

                    /**
                     * This method is like `_.pullAll` except that it accepts `comparator` which
                     * is invoked to compare elements of `array` to `values`. The comparator is
                     * invoked with two arguments: (arrVal, othVal).
                     *
                     * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.6.0
                     * @category Array
                     * @param {Array} array The array to modify.
                     * @param {Array} values The values to remove.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns `array`.
                     * @example
                     *
                     * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
                     *
                     * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
                     * console.log(array);
                     * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
                     */
                    function pullAllWith(array, values, comparator) {
                        return (array && array.length && values && values.length)
                            ? basePullAll(array, values, undefined, comparator)
                            : array;
                    }

                    /**
                     * Removes elements from `array` corresponding to `indexes` and returns an
                     * array of removed elements.
                     *
                     * **Note:** Unlike `_.at`, this method mutates `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to modify.
                     * @param {...(number|number[])} [indexes] The indexes of elements to remove.
                     * @returns {Array} Returns the new array of removed elements.
                     * @example
                     *
                     * var array = ['a', 'b', 'c', 'd'];
                     * var pulled = _.pullAt(array, [1, 3]);
                     *
                     * console.log(array);
                     * // => ['a', 'c']
                     *
                     * console.log(pulled);
                     * // => ['b', 'd']
                     */
                    var pullAt = flatRest(function(array, indexes) {
                        var length = array == null ? 0 : array.length,
                            result = baseAt(array, indexes);

                        basePullAt(array, arrayMap(indexes, function(index) {
                            return isIndex(index, length) ? +index : index;
                        }).sort(compareAscending));

                        return result;
                    });

                    /**
                     * Removes all elements from `array` that `predicate` returns truthy for
                     * and returns an array of the removed elements. The predicate is invoked
                     * with three arguments: (value, index, array).
                     *
                     * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
                     * to pull elements from an array by value.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Array
                     * @param {Array} array The array to modify.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the new array of removed elements.
                     * @example
                     *
                     * var array = [1, 2, 3, 4];
                     * var evens = _.remove(array, function(n) {
     *   return n % 2 == 0;
     * });
                     *
                     * console.log(array);
                     * // => [1, 3]
                     *
                     * console.log(evens);
                     * // => [2, 4]
                     */
                    function remove(array, predicate) {
                        var result = [];
                        if (!(array && array.length)) {
                            return result;
                        }
                        var index = -1,
                            indexes = [],
                            length = array.length;

                        predicate = getIteratee(predicate, 3);
                        while (++index < length) {
                            var value = array[index];
                            if (predicate(value, index, array)) {
                                result.push(value);
                                indexes.push(index);
                            }
                        }
                        basePullAt(array, indexes);
                        return result;
                    }

                    /**
                     * Reverses `array` so that the first element becomes the last, the second
                     * element becomes the second to last, and so on.
                     *
                     * **Note:** This method mutates `array` and is based on
                     * [`Array#reverse`](https://mdn.io/Array/reverse).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to modify.
                     * @returns {Array} Returns `array`.
                     * @example
                     *
                     * var array = [1, 2, 3];
                     *
                     * _.reverse(array);
                     * // => [3, 2, 1]
                     *
                     * console.log(array);
                     * // => [3, 2, 1]
                     */
                    function reverse(array) {
                        return array == null ? array : nativeReverse.call(array);
                    }

                    /**
                     * Creates a slice of `array` from `start` up to, but not including, `end`.
                     *
                     * **Note:** This method is used instead of
                     * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
                     * returned.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to slice.
                     * @param {number} [start=0] The start position.
                     * @param {number} [end=array.length] The end position.
                     * @returns {Array} Returns the slice of `array`.
                     */
                    function slice(array, start, end) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return [];
                        }
                        if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
                            start = 0;
                            end = length;
                        }
                        else {
                            start = start == null ? 0 : toInteger(start);
                            end = end === undefined ? length : toInteger(end);
                        }
                        return baseSlice(array, start, end);
                    }

                    /**
                     * Uses a binary search to determine the lowest index at which `value`
                     * should be inserted into `array` in order to maintain its sort order.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The sorted array to inspect.
                     * @param {*} value The value to evaluate.
                     * @returns {number} Returns the index at which `value` should be inserted
                     *  into `array`.
                     * @example
                     *
                     * _.sortedIndex([30, 50], 40);
                     * // => 1
                     */
                    function sortedIndex(array, value) {
                        return baseSortedIndex(array, value);
                    }

                    /**
                     * This method is like `_.sortedIndex` except that it accepts `iteratee`
                     * which is invoked for `value` and each element of `array` to compute their
                     * sort ranking. The iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The sorted array to inspect.
                     * @param {*} value The value to evaluate.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {number} Returns the index at which `value` should be inserted
                     *  into `array`.
                     * @example
                     *
                     * var objects = [{ 'x': 4 }, { 'x': 5 }];
                     *
                     * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
                     * // => 0
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
                     * // => 0
                     */
                    function sortedIndexBy(array, value, iteratee) {
                        return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
                    }

                    /**
                     * This method is like `_.indexOf` except that it performs a binary
                     * search on a sorted `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {*} value The value to search for.
                     * @returns {number} Returns the index of the matched value, else `-1`.
                     * @example
                     *
                     * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
                     * // => 1
                     */
                    function sortedIndexOf(array, value) {
                        var length = array == null ? 0 : array.length;
                        if (length) {
                            var index = baseSortedIndex(array, value);
                            if (index < length && eq(array[index], value)) {
                                return index;
                            }
                        }
                        return -1;
                    }

                    /**
                     * This method is like `_.sortedIndex` except that it returns the highest
                     * index at which `value` should be inserted into `array` in order to
                     * maintain its sort order.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The sorted array to inspect.
                     * @param {*} value The value to evaluate.
                     * @returns {number} Returns the index at which `value` should be inserted
                     *  into `array`.
                     * @example
                     *
                     * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
                     * // => 4
                     */
                    function sortedLastIndex(array, value) {
                        return baseSortedIndex(array, value, true);
                    }

                    /**
                     * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
                     * which is invoked for `value` and each element of `array` to compute their
                     * sort ranking. The iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The sorted array to inspect.
                     * @param {*} value The value to evaluate.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {number} Returns the index at which `value` should be inserted
                     *  into `array`.
                     * @example
                     *
                     * var objects = [{ 'x': 4 }, { 'x': 5 }];
                     *
                     * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
                     * // => 1
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
                     * // => 1
                     */
                    function sortedLastIndexBy(array, value, iteratee) {
                        return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
                    }

                    /**
                     * This method is like `_.lastIndexOf` except that it performs a binary
                     * search on a sorted `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {*} value The value to search for.
                     * @returns {number} Returns the index of the matched value, else `-1`.
                     * @example
                     *
                     * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
                     * // => 3
                     */
                    function sortedLastIndexOf(array, value) {
                        var length = array == null ? 0 : array.length;
                        if (length) {
                            var index = baseSortedIndex(array, value, true) - 1;
                            if (eq(array[index], value)) {
                                return index;
                            }
                        }
                        return -1;
                    }

                    /**
                     * This method is like `_.uniq` except that it's designed and optimized
                     * for sorted arrays.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @returns {Array} Returns the new duplicate free array.
                     * @example
                     *
                     * _.sortedUniq([1, 1, 2]);
                     * // => [1, 2]
                     */
                    function sortedUniq(array) {
                        return (array && array.length)
                            ? baseSortedUniq(array)
                            : [];
                    }

                    /**
                     * This method is like `_.uniqBy` except that it's designed and optimized
                     * for sorted arrays.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {Function} [iteratee] The iteratee invoked per element.
                     * @returns {Array} Returns the new duplicate free array.
                     * @example
                     *
                     * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
                     * // => [1.1, 2.3]
                     */
                    function sortedUniqBy(array, iteratee) {
                        return (array && array.length)
                            ? baseSortedUniq(array, getIteratee(iteratee, 2))
                            : [];
                    }

                    /**
                     * Gets all but the first element of `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * _.tail([1, 2, 3]);
                     * // => [2, 3]
                     */
                    function tail(array) {
                        var length = array == null ? 0 : array.length;
                        return length ? baseSlice(array, 1, length) : [];
                    }

                    /**
                     * Creates a slice of `array` with `n` elements taken from the beginning.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {number} [n=1] The number of elements to take.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * _.take([1, 2, 3]);
                     * // => [1]
                     *
                     * _.take([1, 2, 3], 2);
                     * // => [1, 2]
                     *
                     * _.take([1, 2, 3], 5);
                     * // => [1, 2, 3]
                     *
                     * _.take([1, 2, 3], 0);
                     * // => []
                     */
                    function take(array, n, guard) {
                        if (!(array && array.length)) {
                            return [];
                        }
                        n = (guard || n === undefined) ? 1 : toInteger(n);
                        return baseSlice(array, 0, n < 0 ? 0 : n);
                    }

                    /**
                     * Creates a slice of `array` with `n` elements taken from the end.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {number} [n=1] The number of elements to take.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * _.takeRight([1, 2, 3]);
                     * // => [3]
                     *
                     * _.takeRight([1, 2, 3], 2);
                     * // => [2, 3]
                     *
                     * _.takeRight([1, 2, 3], 5);
                     * // => [1, 2, 3]
                     *
                     * _.takeRight([1, 2, 3], 0);
                     * // => []
                     */
                    function takeRight(array, n, guard) {
                        var length = array == null ? 0 : array.length;
                        if (!length) {
                            return [];
                        }
                        n = (guard || n === undefined) ? 1 : toInteger(n);
                        n = length - n;
                        return baseSlice(array, n < 0 ? 0 : n, length);
                    }

                    /**
                     * Creates a slice of `array` with elements taken from the end. Elements are
                     * taken until `predicate` returns falsey. The predicate is invoked with
                     * three arguments: (value, index, array).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'active': true },
                     *   { 'user': 'fred',    'active': false },
                     *   { 'user': 'pebbles', 'active': false }
                     * ];
                     *
                     * _.takeRightWhile(users, function(o) { return !o.active; });
                     * // => objects for ['fred', 'pebbles']
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
                     * // => objects for ['pebbles']
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.takeRightWhile(users, ['active', false]);
                     * // => objects for ['fred', 'pebbles']
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.takeRightWhile(users, 'active');
                     * // => []
                     */
                    function takeRightWhile(array, predicate) {
                        return (array && array.length)
                            ? baseWhile(array, getIteratee(predicate, 3), false, true)
                            : [];
                    }

                    /**
                     * Creates a slice of `array` with elements taken from the beginning. Elements
                     * are taken until `predicate` returns falsey. The predicate is invoked with
                     * three arguments: (value, index, array).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Array
                     * @param {Array} array The array to query.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the slice of `array`.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'active': false },
                     *   { 'user': 'fred',    'active': false },
                     *   { 'user': 'pebbles', 'active': true }
                     * ];
                     *
                     * _.takeWhile(users, function(o) { return !o.active; });
                     * // => objects for ['barney', 'fred']
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.takeWhile(users, { 'user': 'barney', 'active': false });
                     * // => objects for ['barney']
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.takeWhile(users, ['active', false]);
                     * // => objects for ['barney', 'fred']
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.takeWhile(users, 'active');
                     * // => []
                     */
                    function takeWhile(array, predicate) {
                        return (array && array.length)
                            ? baseWhile(array, getIteratee(predicate, 3))
                            : [];
                    }

                    /**
                     * Creates an array of unique values, in order, from all given arrays using
                     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @returns {Array} Returns the new array of combined values.
                     * @example
                     *
                     * _.union([2], [1, 2]);
                     * // => [2, 1]
                     */
                    var union = baseRest(function(arrays) {
                        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
                    });

                    /**
                     * This method is like `_.union` except that it accepts `iteratee` which is
                     * invoked for each element of each `arrays` to generate the criterion by
                     * which uniqueness is computed. Result values are chosen from the first
                     * array in which the value occurs. The iteratee is invoked with one argument:
                     * (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {Array} Returns the new array of combined values.
                     * @example
                     *
                     * _.unionBy([2.1], [1.2, 2.3], Math.floor);
                     * // => [2.1, 1.2]
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
                     * // => [{ 'x': 1 }, { 'x': 2 }]
                     */
                    var unionBy = baseRest(function(arrays) {
                        var iteratee = last(arrays);
                        if (isArrayLikeObject(iteratee)) {
                            iteratee = undefined;
                        }
                        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
                    });

                    /**
                     * This method is like `_.union` except that it accepts `comparator` which
                     * is invoked to compare elements of `arrays`. Result values are chosen from
                     * the first array in which the value occurs. The comparator is invoked
                     * with two arguments: (arrVal, othVal).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new array of combined values.
                     * @example
                     *
                     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
                     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
                     *
                     * _.unionWith(objects, others, _.isEqual);
                     * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
                     */
                    var unionWith = baseRest(function(arrays) {
                        var comparator = last(arrays);
                        comparator = typeof comparator == 'function' ? comparator : undefined;
                        return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
                    });

                    /**
                     * Creates a duplicate-free version of an array, using
                     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons, in which only the first occurrence of each element
                     * is kept. The order of result values is determined by the order they occur
                     * in the array.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @returns {Array} Returns the new duplicate free array.
                     * @example
                     *
                     * _.uniq([2, 1, 2]);
                     * // => [2, 1]
                     */
                    function uniq(array) {
                        return (array && array.length) ? baseUniq(array) : [];
                    }

                    /**
                     * This method is like `_.uniq` except that it accepts `iteratee` which is
                     * invoked for each element in `array` to generate the criterion by which
                     * uniqueness is computed. The order of result values is determined by the
                     * order they occur in the array. The iteratee is invoked with one argument:
                     * (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {Array} Returns the new duplicate free array.
                     * @example
                     *
                     * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
                     * // => [2.1, 1.2]
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
                     * // => [{ 'x': 1 }, { 'x': 2 }]
                     */
                    function uniqBy(array, iteratee) {
                        return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
                    }

                    /**
                     * This method is like `_.uniq` except that it accepts `comparator` which
                     * is invoked to compare elements of `array`. The order of result values is
                     * determined by the order they occur in the array.The comparator is invoked
                     * with two arguments: (arrVal, othVal).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new duplicate free array.
                     * @example
                     *
                     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
                     *
                     * _.uniqWith(objects, _.isEqual);
                     * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
                     */
                    function uniqWith(array, comparator) {
                        comparator = typeof comparator == 'function' ? comparator : undefined;
                        return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
                    }

                    /**
                     * This method is like `_.zip` except that it accepts an array of grouped
                     * elements and creates an array regrouping the elements to their pre-zip
                     * configuration.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.2.0
                     * @category Array
                     * @param {Array} array The array of grouped elements to process.
                     * @returns {Array} Returns the new array of regrouped elements.
                     * @example
                     *
                     * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
                     * // => [['a', 1, true], ['b', 2, false]]
                     *
                     * _.unzip(zipped);
                     * // => [['a', 'b'], [1, 2], [true, false]]
                     */
                    function unzip(array) {
                        if (!(array && array.length)) {
                            return [];
                        }
                        var length = 0;
                        array = arrayFilter(array, function(group) {
                            if (isArrayLikeObject(group)) {
                                length = nativeMax(group.length, length);
                                return true;
                            }
                        });
                        return baseTimes(length, function(index) {
                            return arrayMap(array, baseProperty(index));
                        });
                    }

                    /**
                     * This method is like `_.unzip` except that it accepts `iteratee` to specify
                     * how regrouped values should be combined. The iteratee is invoked with the
                     * elements of each group: (...group).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.8.0
                     * @category Array
                     * @param {Array} array The array of grouped elements to process.
                     * @param {Function} [iteratee=_.identity] The function to combine
                     *  regrouped values.
                     * @returns {Array} Returns the new array of regrouped elements.
                     * @example
                     *
                     * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
                     * // => [[1, 10, 100], [2, 20, 200]]
                     *
                     * _.unzipWith(zipped, _.add);
                     * // => [3, 30, 300]
                     */
                    function unzipWith(array, iteratee) {
                        if (!(array && array.length)) {
                            return [];
                        }
                        var result = unzip(array);
                        if (iteratee == null) {
                            return result;
                        }
                        return arrayMap(result, function(group) {
                            return apply(iteratee, undefined, group);
                        });
                    }

                    /**
                     * Creates an array excluding all given values using
                     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * for equality comparisons.
                     *
                     * **Note:** Unlike `_.pull`, this method returns a new array.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {Array} array The array to inspect.
                     * @param {...*} [values] The values to exclude.
                     * @returns {Array} Returns the new array of filtered values.
                     * @see _.difference, _.xor
                     * @example
                     *
                     * _.without([2, 1, 2, 3], 1, 2);
                     * // => [3]
                     */
                    var without = baseRest(function(array, values) {
                        return isArrayLikeObject(array)
                            ? baseDifference(array, values)
                            : [];
                    });

                    /**
                     * Creates an array of unique values that is the
                     * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
                     * of the given arrays. The order of result values is determined by the order
                     * they occur in the arrays.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.4.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @returns {Array} Returns the new array of filtered values.
                     * @see _.difference, _.without
                     * @example
                     *
                     * _.xor([2, 1], [2, 3]);
                     * // => [1, 3]
                     */
                    var xor = baseRest(function(arrays) {
                        return baseXor(arrayFilter(arrays, isArrayLikeObject));
                    });

                    /**
                     * This method is like `_.xor` except that it accepts `iteratee` which is
                     * invoked for each element of each `arrays` to generate the criterion by
                     * which by which they're compared. The order of result values is determined
                     * by the order they occur in the arrays. The iteratee is invoked with one
                     * argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {Array} Returns the new array of filtered values.
                     * @example
                     *
                     * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
                     * // => [1.2, 3.4]
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
                     * // => [{ 'x': 2 }]
                     */
                    var xorBy = baseRest(function(arrays) {
                        var iteratee = last(arrays);
                        if (isArrayLikeObject(iteratee)) {
                            iteratee = undefined;
                        }
                        return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
                    });

                    /**
                     * This method is like `_.xor` except that it accepts `comparator` which is
                     * invoked to compare elements of `arrays`. The order of result values is
                     * determined by the order they occur in the arrays. The comparator is invoked
                     * with two arguments: (arrVal, othVal).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to inspect.
                     * @param {Function} [comparator] The comparator invoked per element.
                     * @returns {Array} Returns the new array of filtered values.
                     * @example
                     *
                     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
                     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
                     *
                     * _.xorWith(objects, others, _.isEqual);
                     * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
                     */
                    var xorWith = baseRest(function(arrays) {
                        var comparator = last(arrays);
                        comparator = typeof comparator == 'function' ? comparator : undefined;
                        return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
                    });

                    /**
                     * Creates an array of grouped elements, the first of which contains the
                     * first elements of the given arrays, the second of which contains the
                     * second elements of the given arrays, and so on.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to process.
                     * @returns {Array} Returns the new array of grouped elements.
                     * @example
                     *
                     * _.zip(['a', 'b'], [1, 2], [true, false]);
                     * // => [['a', 1, true], ['b', 2, false]]
                     */
                    var zip = baseRest(unzip);

                    /**
                     * This method is like `_.fromPairs` except that it accepts two arrays,
                     * one of property identifiers and one of corresponding values.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.4.0
                     * @category Array
                     * @param {Array} [props=[]] The property identifiers.
                     * @param {Array} [values=[]] The property values.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * _.zipObject(['a', 'b'], [1, 2]);
                     * // => { 'a': 1, 'b': 2 }
                     */
                    function zipObject(props, values) {
                        return baseZipObject(props || [], values || [], assignValue);
                    }

                    /**
                     * This method is like `_.zipObject` except that it supports property paths.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.1.0
                     * @category Array
                     * @param {Array} [props=[]] The property identifiers.
                     * @param {Array} [values=[]] The property values.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
                     * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
                     */
                    function zipObjectDeep(props, values) {
                        return baseZipObject(props || [], values || [], baseSet);
                    }

                    /**
                     * This method is like `_.zip` except that it accepts `iteratee` to specify
                     * how grouped values should be combined. The iteratee is invoked with the
                     * elements of each group: (...group).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.8.0
                     * @category Array
                     * @param {...Array} [arrays] The arrays to process.
                     * @param {Function} [iteratee=_.identity] The function to combine
                     *  grouped values.
                     * @returns {Array} Returns the new array of grouped elements.
                     * @example
                     *
                     * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
     *   return a + b + c;
     * });
                     * // => [111, 222]
                     */
                    var zipWith = baseRest(function(arrays) {
                        var length = arrays.length,
                            iteratee = length > 1 ? arrays[length - 1] : undefined;

                        iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
                        return unzipWith(arrays, iteratee);
                    });

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates a `lodash` wrapper instance that wraps `value` with explicit method
                     * chain sequences enabled. The result of such sequences must be unwrapped
                     * with `_#value`.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.3.0
                     * @category Seq
                     * @param {*} value The value to wrap.
                     * @returns {Object} Returns the new `lodash` wrapper instance.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'age': 36 },
                     *   { 'user': 'fred',    'age': 40 },
                     *   { 'user': 'pebbles', 'age': 1 }
                     * ];
                     *
                     * var youngest = _
                     *   .chain(users)
                     *   .sortBy('age')
                     *   .map(function(o) {
     *     return o.user + ' is ' + o.age;
     *   })
                     *   .head()
                     *   .value();
                     * // => 'pebbles is 1'
                     */
                    function chain(value) {
                        var result = lodash(value);
                        result.__chain__ = true;
                        return result;
                    }

                    /**
                     * This method invokes `interceptor` and returns `value`. The interceptor
                     * is invoked with one argument; (value). The purpose of this method is to
                     * "tap into" a method chain sequence in order to modify intermediate results.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Seq
                     * @param {*} value The value to provide to `interceptor`.
                     * @param {Function} interceptor The function to invoke.
                     * @returns {*} Returns `value`.
                     * @example
                     *
                     * _([1, 2, 3])
                     *  .tap(function(array) {
     *    // Mutate input array.
     *    array.pop();
     *  })
                     *  .reverse()
                     *  .value();
                     * // => [2, 1]
                     */
                    function tap(value, interceptor) {
                        interceptor(value);
                        return value;
                    }

                    /**
                     * This method is like `_.tap` except that it returns the result of `interceptor`.
                     * The purpose of this method is to "pass thru" values replacing intermediate
                     * results in a method chain sequence.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Seq
                     * @param {*} value The value to provide to `interceptor`.
                     * @param {Function} interceptor The function to invoke.
                     * @returns {*} Returns the result of `interceptor`.
                     * @example
                     *
                     * _('  abc  ')
                     *  .chain()
                     *  .trim()
                     *  .thru(function(value) {
     *    return [value];
     *  })
                     *  .value();
                     * // => ['abc']
                     */
                    function thru(value, interceptor) {
                        return interceptor(value);
                    }

                    /**
                     * This method is the wrapper version of `_.at`.
                     *
                     * @name at
                     * @memberOf _
                     * @since 1.0.0
                     * @category Seq
                     * @param {...(string|string[])} [paths] The property paths to pick.
                     * @returns {Object} Returns the new `lodash` wrapper instance.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
                     *
                     * _(object).at(['a[0].b.c', 'a[1]']).value();
                     * // => [3, 4]
                     */
                    var wrapperAt = flatRest(function(paths) {
                        var length = paths.length,
                            start = length ? paths[0] : 0,
                            value = this.__wrapped__,
                            interceptor = function(object) { return baseAt(object, paths); };

                        if (length > 1 || this.__actions__.length ||
                            !(value instanceof LazyWrapper) || !isIndex(start)) {
                            return this.thru(interceptor);
                        }
                        value = value.slice(start, +start + (length ? 1 : 0));
                        value.__actions__.push({
                            'func': thru,
                            'args': [interceptor],
                            'thisArg': undefined
                        });
                        return new LodashWrapper(value, this.__chain__).thru(function(array) {
                            if (length && !array.length) {
                                array.push(undefined);
                            }
                            return array;
                        });
                    });

                    /**
                     * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
                     *
                     * @name chain
                     * @memberOf _
                     * @since 0.1.0
                     * @category Seq
                     * @returns {Object} Returns the new `lodash` wrapper instance.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney', 'age': 36 },
                     *   { 'user': 'fred',   'age': 40 }
                     * ];
                     *
                     * // A sequence without explicit chaining.
                     * _(users).head();
                     * // => { 'user': 'barney', 'age': 36 }
                     *
                     * // A sequence with explicit chaining.
                     * _(users)
                     *   .chain()
                     *   .head()
                     *   .pick('user')
                     *   .value();
                     * // => { 'user': 'barney' }
                     */
                    function wrapperChain() {
                        return chain(this);
                    }

                    /**
                     * Executes the chain sequence and returns the wrapped result.
                     *
                     * @name commit
                     * @memberOf _
                     * @since 3.2.0
                     * @category Seq
                     * @returns {Object} Returns the new `lodash` wrapper instance.
                     * @example
                     *
                     * var array = [1, 2];
                     * var wrapped = _(array).push(3);
                     *
                     * console.log(array);
                     * // => [1, 2]
                     *
                     * wrapped = wrapped.commit();
                     * console.log(array);
                     * // => [1, 2, 3]
                     *
                     * wrapped.last();
                     * // => 3
                     *
                     * console.log(array);
                     * // => [1, 2, 3]
                     */
                    function wrapperCommit() {
                        return new LodashWrapper(this.value(), this.__chain__);
                    }

                    /**
                     * Gets the next value on a wrapped object following the
                     * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
                     *
                     * @name next
                     * @memberOf _
                     * @since 4.0.0
                     * @category Seq
                     * @returns {Object} Returns the next iterator value.
                     * @example
                     *
                     * var wrapped = _([1, 2]);
                     *
                     * wrapped.next();
                     * // => { 'done': false, 'value': 1 }
                     *
                     * wrapped.next();
                     * // => { 'done': false, 'value': 2 }
                     *
                     * wrapped.next();
                     * // => { 'done': true, 'value': undefined }
                     */
                    function wrapperNext() {
                        if (this.__values__ === undefined) {
                            this.__values__ = toArray(this.value());
                        }
                        var done = this.__index__ >= this.__values__.length,
                            value = done ? undefined : this.__values__[this.__index__++];

                        return { 'done': done, 'value': value };
                    }

                    /**
                     * Enables the wrapper to be iterable.
                     *
                     * @name Symbol.iterator
                     * @memberOf _
                     * @since 4.0.0
                     * @category Seq
                     * @returns {Object} Returns the wrapper object.
                     * @example
                     *
                     * var wrapped = _([1, 2]);
                     *
                     * wrapped[Symbol.iterator]() === wrapped;
                     * // => true
                     *
                     * Array.from(wrapped);
                     * // => [1, 2]
                     */
                    function wrapperToIterator() {
                        return this;
                    }

                    /**
                     * Creates a clone of the chain sequence planting `value` as the wrapped value.
                     *
                     * @name plant
                     * @memberOf _
                     * @since 3.2.0
                     * @category Seq
                     * @param {*} value The value to plant.
                     * @returns {Object} Returns the new `lodash` wrapper instance.
                     * @example
                     *
                     * function square(n) {
     *   return n * n;
     * }
                     *
                     * var wrapped = _([1, 2]).map(square);
                     * var other = wrapped.plant([3, 4]);
                     *
                     * other.value();
                     * // => [9, 16]
                     *
                     * wrapped.value();
                     * // => [1, 4]
                     */
                    function wrapperPlant(value) {
                        var result,
                            parent = this;

                        while (parent instanceof baseLodash) {
                            var clone = wrapperClone(parent);
                            clone.__index__ = 0;
                            clone.__values__ = undefined;
                            if (result) {
                                previous.__wrapped__ = clone;
                            } else {
                                result = clone;
                            }
                            var previous = clone;
                            parent = parent.__wrapped__;
                        }
                        previous.__wrapped__ = value;
                        return result;
                    }

                    /**
                     * This method is the wrapper version of `_.reverse`.
                     *
                     * **Note:** This method mutates the wrapped array.
                     *
                     * @name reverse
                     * @memberOf _
                     * @since 0.1.0
                     * @category Seq
                     * @returns {Object} Returns the new `lodash` wrapper instance.
                     * @example
                     *
                     * var array = [1, 2, 3];
                     *
                     * _(array).reverse().value()
                     * // => [3, 2, 1]
                     *
                     * console.log(array);
                     * // => [3, 2, 1]
                     */
                    function wrapperReverse() {
                        var value = this.__wrapped__;
                        if (value instanceof LazyWrapper) {
                            var wrapped = value;
                            if (this.__actions__.length) {
                                wrapped = new LazyWrapper(this);
                            }
                            wrapped = wrapped.reverse();
                            wrapped.__actions__.push({
                                'func': thru,
                                'args': [reverse],
                                'thisArg': undefined
                            });
                            return new LodashWrapper(wrapped, this.__chain__);
                        }
                        return this.thru(reverse);
                    }

                    /**
                     * Executes the chain sequence to resolve the unwrapped value.
                     *
                     * @name value
                     * @memberOf _
                     * @since 0.1.0
                     * @alias toJSON, valueOf
                     * @category Seq
                     * @returns {*} Returns the resolved unwrapped value.
                     * @example
                     *
                     * _([1, 2, 3]).value();
                     * // => [1, 2, 3]
                     */
                    function wrapperValue() {
                        return baseWrapperValue(this.__wrapped__, this.__actions__);
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Creates an object composed of keys generated from the results of running
                     * each element of `collection` thru `iteratee`. The corresponding value of
                     * each key is the number of times the key was returned by `iteratee`. The
                     * iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.5.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
                     * @returns {Object} Returns the composed aggregate object.
                     * @example
                     *
                     * _.countBy([6.1, 4.2, 6.3], Math.floor);
                     * // => { '4': 1, '6': 2 }
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.countBy(['one', 'two', 'three'], 'length');
                     * // => { '3': 2, '5': 1 }
                     */
                    var countBy = createAggregator(function(result, value, key) {
                        if (hasOwnProperty.call(result, key)) {
                            ++result[key];
                        } else {
                            baseAssignValue(result, key, 1);
                        }
                    });

                    /**
                     * Checks if `predicate` returns truthy for **all** elements of `collection`.
                     * Iteration is stopped once `predicate` returns falsey. The predicate is
                     * invoked with three arguments: (value, index|key, collection).
                     *
                     * **Note:** This method returns `true` for
                     * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
                     * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
                     * elements of empty collections.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {boolean} Returns `true` if all elements pass the predicate check,
                     *  else `false`.
                     * @example
                     *
                     * _.every([true, 1, null, 'yes'], Boolean);
                     * // => false
                     *
                     * var users = [
                     *   { 'user': 'barney', 'age': 36, 'active': false },
                     *   { 'user': 'fred',   'age': 40, 'active': false }
                     * ];
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.every(users, { 'user': 'barney', 'active': false });
                     * // => false
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.every(users, ['active', false]);
                     * // => true
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.every(users, 'active');
                     * // => false
                     */
                    function every(collection, predicate, guard) {
                        var func = isArray(collection) ? arrayEvery : baseEvery;
                        if (guard && isIterateeCall(collection, predicate, guard)) {
                            predicate = undefined;
                        }
                        return func(collection, getIteratee(predicate, 3));
                    }

                    /**
                     * Iterates over elements of `collection`, returning an array of all elements
                     * `predicate` returns truthy for. The predicate is invoked with three
                     * arguments: (value, index|key, collection).
                     *
                     * **Note:** Unlike `_.remove`, this method returns a new array.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the new filtered array.
                     * @see _.reject
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney', 'age': 36, 'active': true },
                     *   { 'user': 'fred',   'age': 40, 'active': false }
                     * ];
                     *
                     * _.filter(users, function(o) { return !o.active; });
                     * // => objects for ['fred']
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.filter(users, { 'age': 36, 'active': true });
                     * // => objects for ['barney']
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.filter(users, ['active', false]);
                     * // => objects for ['fred']
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.filter(users, 'active');
                     * // => objects for ['barney']
                     */
                    function filter(collection, predicate) {
                        var func = isArray(collection) ? arrayFilter : baseFilter;
                        return func(collection, getIteratee(predicate, 3));
                    }

                    /**
                     * Iterates over elements of `collection`, returning the first element
                     * `predicate` returns truthy for. The predicate is invoked with three
                     * arguments: (value, index|key, collection).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to inspect.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @param {number} [fromIndex=0] The index to search from.
                     * @returns {*} Returns the matched element, else `undefined`.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'age': 36, 'active': true },
                     *   { 'user': 'fred',    'age': 40, 'active': false },
                     *   { 'user': 'pebbles', 'age': 1,  'active': true }
                     * ];
                     *
                     * _.find(users, function(o) { return o.age < 40; });
                     * // => object for 'barney'
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.find(users, { 'age': 1, 'active': true });
                     * // => object for 'pebbles'
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.find(users, ['active', false]);
                     * // => object for 'fred'
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.find(users, 'active');
                     * // => object for 'barney'
                     */
                    var find = createFind(findIndex);

                    /**
                     * This method is like `_.find` except that it iterates over elements of
                     * `collection` from right to left.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to inspect.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @param {number} [fromIndex=collection.length-1] The index to search from.
                     * @returns {*} Returns the matched element, else `undefined`.
                     * @example
                     *
                     * _.findLast([1, 2, 3, 4], function(n) {
     *   return n % 2 == 1;
     * });
                     * // => 3
                     */
                    var findLast = createFind(findLastIndex);

                    /**
                     * Creates a flattened array of values by running each element in `collection`
                     * thru `iteratee` and flattening the mapped results. The iteratee is invoked
                     * with three arguments: (value, index|key, collection).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the new flattened array.
                     * @example
                     *
                     * function duplicate(n) {
     *   return [n, n];
     * }
                     *
                     * _.flatMap([1, 2], duplicate);
                     * // => [1, 1, 2, 2]
                     */
                    function flatMap(collection, iteratee) {
                        return baseFlatten(map(collection, iteratee), 1);
                    }

                    /**
                     * This method is like `_.flatMap` except that it recursively flattens the
                     * mapped results.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.7.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the new flattened array.
                     * @example
                     *
                     * function duplicate(n) {
     *   return [[[n, n]]];
     * }
                     *
                     * _.flatMapDeep([1, 2], duplicate);
                     * // => [1, 1, 2, 2]
                     */
                    function flatMapDeep(collection, iteratee) {
                        return baseFlatten(map(collection, iteratee), INFINITY);
                    }

                    /**
                     * This method is like `_.flatMap` except that it recursively flattens the
                     * mapped results up to `depth` times.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.7.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @param {number} [depth=1] The maximum recursion depth.
                     * @returns {Array} Returns the new flattened array.
                     * @example
                     *
                     * function duplicate(n) {
     *   return [[[n, n]]];
     * }
                     *
                     * _.flatMapDepth([1, 2], duplicate, 2);
                     * // => [[1, 1], [2, 2]]
                     */
                    function flatMapDepth(collection, iteratee, depth) {
                        depth = depth === undefined ? 1 : toInteger(depth);
                        return baseFlatten(map(collection, iteratee), depth);
                    }

                    /**
                     * Iterates over elements of `collection` and invokes `iteratee` for each element.
                     * The iteratee is invoked with three arguments: (value, index|key, collection).
                     * Iteratee functions may exit iteration early by explicitly returning `false`.
                     *
                     * **Note:** As with other "Collections" methods, objects with a "length"
                     * property are iterated like arrays. To avoid this behavior use `_.forIn`
                     * or `_.forOwn` for object iteration.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @alias each
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Array|Object} Returns `collection`.
                     * @see _.forEachRight
                     * @example
                     *
                     * _.forEach([1, 2], function(value) {
     *   console.log(value);
     * });
                     * // => Logs `1` then `2`.
                     *
                     * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
     *   console.log(key);
     * });
                     * // => Logs 'a' then 'b' (iteration order is not guaranteed).
                     */
                    function forEach(collection, iteratee) {
                        var func = isArray(collection) ? arrayEach : baseEach;
                        return func(collection, getIteratee(iteratee, 3));
                    }

                    /**
                     * This method is like `_.forEach` except that it iterates over elements of
                     * `collection` from right to left.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @alias eachRight
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Array|Object} Returns `collection`.
                     * @see _.forEach
                     * @example
                     *
                     * _.forEachRight([1, 2], function(value) {
     *   console.log(value);
     * });
                     * // => Logs `2` then `1`.
                     */
                    function forEachRight(collection, iteratee) {
                        var func = isArray(collection) ? arrayEachRight : baseEachRight;
                        return func(collection, getIteratee(iteratee, 3));
                    }

                    /**
                     * Creates an object composed of keys generated from the results of running
                     * each element of `collection` thru `iteratee`. The order of grouped values
                     * is determined by the order they occur in `collection`. The corresponding
                     * value of each key is an array of elements responsible for generating the
                     * key. The iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
                     * @returns {Object} Returns the composed aggregate object.
                     * @example
                     *
                     * _.groupBy([6.1, 4.2, 6.3], Math.floor);
                     * // => { '4': [4.2], '6': [6.1, 6.3] }
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.groupBy(['one', 'two', 'three'], 'length');
                     * // => { '3': ['one', 'two'], '5': ['three'] }
                     */
                    var groupBy = createAggregator(function(result, value, key) {
                        if (hasOwnProperty.call(result, key)) {
                            result[key].push(value);
                        } else {
                            baseAssignValue(result, key, [value]);
                        }
                    });

                    /**
                     * Checks if `value` is in `collection`. If `collection` is a string, it's
                     * checked for a substring of `value`, otherwise
                     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * is used for equality comparisons. If `fromIndex` is negative, it's used as
                     * the offset from the end of `collection`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object|string} collection The collection to inspect.
                     * @param {*} value The value to search for.
                     * @param {number} [fromIndex=0] The index to search from.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
                     * @returns {boolean} Returns `true` if `value` is found, else `false`.
                     * @example
                     *
                     * _.includes([1, 2, 3], 1);
                     * // => true
                     *
                     * _.includes([1, 2, 3], 1, 2);
                     * // => false
                     *
                     * _.includes({ 'a': 1, 'b': 2 }, 1);
                     * // => true
                     *
                     * _.includes('abcd', 'bc');
                     * // => true
                     */
                    function includes(collection, value, fromIndex, guard) {
                        collection = isArrayLike(collection) ? collection : values(collection);
                        fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;

                        var length = collection.length;
                        if (fromIndex < 0) {
                            fromIndex = nativeMax(length + fromIndex, 0);
                        }
                        return isString(collection)
                            ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
                            : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
                    }

                    /**
                     * Invokes the method at `path` of each element in `collection`, returning
                     * an array of the results of each invoked method. Any additional arguments
                     * are provided to each invoked method. If `path` is a function, it's invoked
                     * for, and `this` bound to, each element in `collection`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Array|Function|string} path The path of the method to invoke or
                     *  the function invoked per iteration.
                     * @param {...*} [args] The arguments to invoke each method with.
                     * @returns {Array} Returns the array of results.
                     * @example
                     *
                     * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
                     * // => [[1, 5, 7], [1, 2, 3]]
                     *
                     * _.invokeMap([123, 456], String.prototype.split, '');
                     * // => [['1', '2', '3'], ['4', '5', '6']]
                     */
                    var invokeMap = baseRest(function(collection, path, args) {
                        var index = -1,
                            isFunc = typeof path == 'function',
                            result = isArrayLike(collection) ? Array(collection.length) : [];

                        baseEach(collection, function(value) {
                            result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
                        });
                        return result;
                    });

                    /**
                     * Creates an object composed of keys generated from the results of running
                     * each element of `collection` thru `iteratee`. The corresponding value of
                     * each key is the last element responsible for generating the key. The
                     * iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
                     * @returns {Object} Returns the composed aggregate object.
                     * @example
                     *
                     * var array = [
                     *   { 'dir': 'left', 'code': 97 },
                     *   { 'dir': 'right', 'code': 100 }
                     * ];
                     *
                     * _.keyBy(array, function(o) {
     *   return String.fromCharCode(o.code);
     * });
                     * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
                     *
                     * _.keyBy(array, 'dir');
                     * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
                     */
                    var keyBy = createAggregator(function(result, value, key) {
                        baseAssignValue(result, key, value);
                    });

                    /**
                     * Creates an array of values by running each element in `collection` thru
                     * `iteratee`. The iteratee is invoked with three arguments:
                     * (value, index|key, collection).
                     *
                     * Many lodash methods are guarded to work as iteratees for methods like
                     * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
                     *
                     * The guarded methods are:
                     * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
                     * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
                     * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
                     * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the new mapped array.
                     * @example
                     *
                     * function square(n) {
     *   return n * n;
     * }
                     *
                     * _.map([4, 8], square);
                     * // => [16, 64]
                     *
                     * _.map({ 'a': 4, 'b': 8 }, square);
                     * // => [16, 64] (iteration order is not guaranteed)
                     *
                     * var users = [
                     *   { 'user': 'barney' },
                     *   { 'user': 'fred' }
                     * ];
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.map(users, 'user');
                     * // => ['barney', 'fred']
                     */
                    function map(collection, iteratee) {
                        var func = isArray(collection) ? arrayMap : baseMap;
                        return func(collection, getIteratee(iteratee, 3));
                    }

                    /**
                     * This method is like `_.sortBy` except that it allows specifying the sort
                     * orders of the iteratees to sort by. If `orders` is unspecified, all values
                     * are sorted in ascending order. Otherwise, specify an order of "desc" for
                     * descending or "asc" for ascending sort order of corresponding values.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
                     *  The iteratees to sort by.
                     * @param {string[]} [orders] The sort orders of `iteratees`.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
                     * @returns {Array} Returns the new sorted array.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'fred',   'age': 48 },
                     *   { 'user': 'barney', 'age': 34 },
                     *   { 'user': 'fred',   'age': 40 },
                     *   { 'user': 'barney', 'age': 36 }
                     * ];
                     *
                     * // Sort by `user` in ascending order and by `age` in descending order.
                     * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
                     * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
                     */
                    function orderBy(collection, iteratees, orders, guard) {
                        if (collection == null) {
                            return [];
                        }
                        if (!isArray(iteratees)) {
                            iteratees = iteratees == null ? [] : [iteratees];
                        }
                        orders = guard ? undefined : orders;
                        if (!isArray(orders)) {
                            orders = orders == null ? [] : [orders];
                        }
                        return baseOrderBy(collection, iteratees, orders);
                    }

                    /**
                     * Creates an array of elements split into two groups, the first of which
                     * contains elements `predicate` returns truthy for, the second of which
                     * contains elements `predicate` returns falsey for. The predicate is
                     * invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the array of grouped elements.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney',  'age': 36, 'active': false },
                     *   { 'user': 'fred',    'age': 40, 'active': true },
                     *   { 'user': 'pebbles', 'age': 1,  'active': false }
                     * ];
                     *
                     * _.partition(users, function(o) { return o.active; });
                     * // => objects for [['fred'], ['barney', 'pebbles']]
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.partition(users, { 'age': 1, 'active': false });
                     * // => objects for [['pebbles'], ['barney', 'fred']]
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.partition(users, ['active', false]);
                     * // => objects for [['barney', 'pebbles'], ['fred']]
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.partition(users, 'active');
                     * // => objects for [['fred'], ['barney', 'pebbles']]
                     */
                    var partition = createAggregator(function(result, value, key) {
                        result[key ? 0 : 1].push(value);
                    }, function() { return [[], []]; });

                    /**
                     * Reduces `collection` to a value which is the accumulated result of running
                     * each element in `collection` thru `iteratee`, where each successive
                     * invocation is supplied the return value of the previous. If `accumulator`
                     * is not given, the first element of `collection` is used as the initial
                     * value. The iteratee is invoked with four arguments:
                     * (accumulator, value, index|key, collection).
                     *
                     * Many lodash methods are guarded to work as iteratees for methods like
                     * `_.reduce`, `_.reduceRight`, and `_.transform`.
                     *
                     * The guarded methods are:
                     * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
                     * and `sortBy`
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @param {*} [accumulator] The initial value.
                     * @returns {*} Returns the accumulated value.
                     * @see _.reduceRight
                     * @example
                     *
                     * _.reduce([1, 2], function(sum, n) {
     *   return sum + n;
     * }, 0);
                     * // => 3
                     *
                     * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
     *   (result[value] || (result[value] = [])).push(key);
     *   return result;
     * }, {});
                     * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
                     */
                    function reduce(collection, iteratee, accumulator) {
                        var func = isArray(collection) ? arrayReduce : baseReduce,
                            initAccum = arguments.length < 3;

                        return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
                    }

                    /**
                     * This method is like `_.reduce` except that it iterates over elements of
                     * `collection` from right to left.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @param {*} [accumulator] The initial value.
                     * @returns {*} Returns the accumulated value.
                     * @see _.reduce
                     * @example
                     *
                     * var array = [[0, 1], [2, 3], [4, 5]];
                     *
                     * _.reduceRight(array, function(flattened, other) {
     *   return flattened.concat(other);
     * }, []);
                     * // => [4, 5, 2, 3, 0, 1]
                     */
                    function reduceRight(collection, iteratee, accumulator) {
                        var func = isArray(collection) ? arrayReduceRight : baseReduce,
                            initAccum = arguments.length < 3;

                        return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
                    }

                    /**
                     * The opposite of `_.filter`; this method returns the elements of `collection`
                     * that `predicate` does **not** return truthy for.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the new filtered array.
                     * @see _.filter
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney', 'age': 36, 'active': false },
                     *   { 'user': 'fred',   'age': 40, 'active': true }
                     * ];
                     *
                     * _.reject(users, function(o) { return !o.active; });
                     * // => objects for ['fred']
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.reject(users, { 'age': 40, 'active': true });
                     * // => objects for ['barney']
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.reject(users, ['active', false]);
                     * // => objects for ['fred']
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.reject(users, 'active');
                     * // => objects for ['barney']
                     */
                    function reject(collection, predicate) {
                        var func = isArray(collection) ? arrayFilter : baseFilter;
                        return func(collection, negate(getIteratee(predicate, 3)));
                    }

                    /**
                     * Gets a random element from `collection`.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to sample.
                     * @returns {*} Returns the random element.
                     * @example
                     *
                     * _.sample([1, 2, 3, 4]);
                     * // => 2
                     */
                    function sample(collection) {
                        var func = isArray(collection) ? arraySample : baseSample;
                        return func(collection);
                    }

                    /**
                     * Gets `n` random elements at unique keys from `collection` up to the
                     * size of `collection`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to sample.
                     * @param {number} [n=1] The number of elements to sample.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Array} Returns the random elements.
                     * @example
                     *
                     * _.sampleSize([1, 2, 3], 2);
                     * // => [3, 1]
                     *
                     * _.sampleSize([1, 2, 3], 4);
                     * // => [2, 3, 1]
                     */
                    function sampleSize(collection, n, guard) {
                        if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
                            n = 1;
                        } else {
                            n = toInteger(n);
                        }
                        var func = isArray(collection) ? arraySampleSize : baseSampleSize;
                        return func(collection, n);
                    }

                    /**
                     * Creates an array of shuffled values, using a version of the
                     * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to shuffle.
                     * @returns {Array} Returns the new shuffled array.
                     * @example
                     *
                     * _.shuffle([1, 2, 3, 4]);
                     * // => [4, 1, 3, 2]
                     */
                    function shuffle(collection) {
                        var func = isArray(collection) ? arrayShuffle : baseShuffle;
                        return func(collection);
                    }

                    /**
                     * Gets the size of `collection` by returning its length for array-like
                     * values or the number of own enumerable string keyed properties for objects.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object|string} collection The collection to inspect.
                     * @returns {number} Returns the collection size.
                     * @example
                     *
                     * _.size([1, 2, 3]);
                     * // => 3
                     *
                     * _.size({ 'a': 1, 'b': 2 });
                     * // => 2
                     *
                     * _.size('pebbles');
                     * // => 7
                     */
                    function size(collection) {
                        if (collection == null) {
                            return 0;
                        }
                        if (isArrayLike(collection)) {
                            return isString(collection) ? stringSize(collection) : collection.length;
                        }
                        var tag = getTag(collection);
                        if (tag == mapTag || tag == setTag) {
                            return collection.size;
                        }
                        return baseKeys(collection).length;
                    }

                    /**
                     * Checks if `predicate` returns truthy for **any** element of `collection`.
                     * Iteration is stopped once `predicate` returns truthy. The predicate is
                     * invoked with three arguments: (value, index|key, collection).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {boolean} Returns `true` if any element passes the predicate check,
                     *  else `false`.
                     * @example
                     *
                     * _.some([null, 0, 'yes', false], Boolean);
                     * // => true
                     *
                     * var users = [
                     *   { 'user': 'barney', 'active': true },
                     *   { 'user': 'fred',   'active': false }
                     * ];
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.some(users, { 'user': 'barney', 'active': false });
                     * // => false
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.some(users, ['active', false]);
                     * // => true
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.some(users, 'active');
                     * // => true
                     */
                    function some(collection, predicate, guard) {
                        var func = isArray(collection) ? arraySome : baseSome;
                        if (guard && isIterateeCall(collection, predicate, guard)) {
                            predicate = undefined;
                        }
                        return func(collection, getIteratee(predicate, 3));
                    }

                    /**
                     * Creates an array of elements, sorted in ascending order by the results of
                     * running each element in a collection thru each iteratee. This method
                     * performs a stable sort, that is, it preserves the original sort order of
                     * equal elements. The iteratees are invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Collection
                     * @param {Array|Object} collection The collection to iterate over.
                     * @param {...(Function|Function[])} [iteratees=[_.identity]]
                     *  The iteratees to sort by.
                     * @returns {Array} Returns the new sorted array.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'fred',   'age': 48 },
                     *   { 'user': 'barney', 'age': 36 },
                     *   { 'user': 'fred',   'age': 40 },
                     *   { 'user': 'barney', 'age': 34 }
                     * ];
                     *
                     * _.sortBy(users, [function(o) { return o.user; }]);
                     * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
                     *
                     * _.sortBy(users, ['user', 'age']);
                     * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
                     */
                    var sortBy = baseRest(function(collection, iteratees) {
                        if (collection == null) {
                            return [];
                        }
                        var length = iteratees.length;
                        if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
                            iteratees = [];
                        } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
                            iteratees = [iteratees[0]];
                        }
                        return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
                    });

                    /*------------------------------------------------------------------------*/

                    /**
                     * Gets the timestamp of the number of milliseconds that have elapsed since
                     * the Unix epoch (1 January 1970 00:00:00 UTC).
                     *
                     * @static
                     * @memberOf _
                     * @since 2.4.0
                     * @category Date
                     * @returns {number} Returns the timestamp.
                     * @example
                     *
                     * _.defer(function(stamp) {
     *   console.log(_.now() - stamp);
     * }, _.now());
                     * // => Logs the number of milliseconds it took for the deferred invocation.
                     */
                    var now = ctxNow || function() {
                        return root.Date.now();
                    };

                    /*------------------------------------------------------------------------*/

                    /**
                     * The opposite of `_.before`; this method creates a function that invokes
                     * `func` once it's called `n` or more times.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {number} n The number of calls before `func` is invoked.
                     * @param {Function} func The function to restrict.
                     * @returns {Function} Returns the new restricted function.
                     * @example
                     *
                     * var saves = ['profile', 'settings'];
                     *
                     * var done = _.after(saves.length, function() {
     *   console.log('done saving!');
     * });
                     *
                     * _.forEach(saves, function(type) {
     *   asyncSave({ 'type': type, 'complete': done });
     * });
                     * // => Logs 'done saving!' after the two async saves have completed.
                     */
                    function after(n, func) {
                        if (typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        n = toInteger(n);
                        return function() {
                            if (--n < 1) {
                                return func.apply(this, arguments);
                            }
                        };
                    }

                    /**
                     * Creates a function that invokes `func`, with up to `n` arguments,
                     * ignoring any additional arguments.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Function
                     * @param {Function} func The function to cap arguments for.
                     * @param {number} [n=func.length] The arity cap.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Function} Returns the new capped function.
                     * @example
                     *
                     * _.map(['6', '8', '10'], _.ary(parseInt, 1));
                     * // => [6, 8, 10]
                     */
                    function ary(func, n, guard) {
                        n = guard ? undefined : n;
                        n = (func && n == null) ? func.length : n;
                        return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
                    }

                    /**
                     * Creates a function that invokes `func`, with the `this` binding and arguments
                     * of the created function, while it's called less than `n` times. Subsequent
                     * calls to the created function return the result of the last `func` invocation.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Function
                     * @param {number} n The number of calls at which `func` is no longer invoked.
                     * @param {Function} func The function to restrict.
                     * @returns {Function} Returns the new restricted function.
                     * @example
                     *
                     * jQuery(element).on('click', _.before(5, addContactToList));
                     * // => Allows adding up to 4 contacts to the list.
                     */
                    function before(n, func) {
                        var result;
                        if (typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        n = toInteger(n);
                        return function() {
                            if (--n > 0) {
                                result = func.apply(this, arguments);
                            }
                            if (n <= 1) {
                                func = undefined;
                            }
                            return result;
                        };
                    }

                    /**
                     * Creates a function that invokes `func` with the `this` binding of `thisArg`
                     * and `partials` prepended to the arguments it receives.
                     *
                     * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
                     * may be used as a placeholder for partially applied arguments.
                     *
                     * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
                     * property of bound functions.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {Function} func The function to bind.
                     * @param {*} thisArg The `this` binding of `func`.
                     * @param {...*} [partials] The arguments to be partially applied.
                     * @returns {Function} Returns the new bound function.
                     * @example
                     *
                     * function greet(greeting, punctuation) {
     *   return greeting + ' ' + this.user + punctuation;
     * }
                     *
                     * var object = { 'user': 'fred' };
                     *
                     * var bound = _.bind(greet, object, 'hi');
                     * bound('!');
                     * // => 'hi fred!'
                     *
                     * // Bound with placeholders.
                     * var bound = _.bind(greet, object, _, '!');
                     * bound('hi');
                     * // => 'hi fred!'
                     */
                    var bind = baseRest(function(func, thisArg, partials) {
                        var bitmask = WRAP_BIND_FLAG;
                        if (partials.length) {
                            var holders = replaceHolders(partials, getHolder(bind));
                            bitmask |= WRAP_PARTIAL_FLAG;
                        }
                        return createWrap(func, bitmask, thisArg, partials, holders);
                    });

                    /**
                     * Creates a function that invokes the method at `object[key]` with `partials`
                     * prepended to the arguments it receives.
                     *
                     * This method differs from `_.bind` by allowing bound functions to reference
                     * methods that may be redefined or don't yet exist. See
                     * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
                     * for more details.
                     *
                     * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
                     * builds, may be used as a placeholder for partially applied arguments.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.10.0
                     * @category Function
                     * @param {Object} object The object to invoke the method on.
                     * @param {string} key The key of the method.
                     * @param {...*} [partials] The arguments to be partially applied.
                     * @returns {Function} Returns the new bound function.
                     * @example
                     *
                     * var object = {
     *   'user': 'fred',
     *   'greet': function(greeting, punctuation) {
     *     return greeting + ' ' + this.user + punctuation;
     *   }
     * };
                     *
                     * var bound = _.bindKey(object, 'greet', 'hi');
                     * bound('!');
                     * // => 'hi fred!'
                     *
                     * object.greet = function(greeting, punctuation) {
     *   return greeting + 'ya ' + this.user + punctuation;
     * };
                     *
                     * bound('!');
                     * // => 'hiya fred!'
                     *
                     * // Bound with placeholders.
                     * var bound = _.bindKey(object, 'greet', _, '!');
                     * bound('hi');
                     * // => 'hiya fred!'
                     */
                    var bindKey = baseRest(function(object, key, partials) {
                        var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
                        if (partials.length) {
                            var holders = replaceHolders(partials, getHolder(bindKey));
                            bitmask |= WRAP_PARTIAL_FLAG;
                        }
                        return createWrap(key, bitmask, object, partials, holders);
                    });

                    /**
                     * Creates a function that accepts arguments of `func` and either invokes
                     * `func` returning its result, if at least `arity` number of arguments have
                     * been provided, or returns a function that accepts the remaining `func`
                     * arguments, and so on. The arity of `func` may be specified if `func.length`
                     * is not sufficient.
                     *
                     * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
                     * may be used as a placeholder for provided arguments.
                     *
                     * **Note:** This method doesn't set the "length" property of curried functions.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Function
                     * @param {Function} func The function to curry.
                     * @param {number} [arity=func.length] The arity of `func`.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Function} Returns the new curried function.
                     * @example
                     *
                     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
                     *
                     * var curried = _.curry(abc);
                     *
                     * curried(1)(2)(3);
                     * // => [1, 2, 3]
                     *
                     * curried(1, 2)(3);
                     * // => [1, 2, 3]
                     *
                     * curried(1, 2, 3);
                     * // => [1, 2, 3]
                     *
                     * // Curried with placeholders.
                     * curried(1)(_, 3)(2);
                     * // => [1, 2, 3]
                     */
                    function curry(func, arity, guard) {
                        arity = guard ? undefined : arity;
                        var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
                        result.placeholder = curry.placeholder;
                        return result;
                    }

                    /**
                     * This method is like `_.curry` except that arguments are applied to `func`
                     * in the manner of `_.partialRight` instead of `_.partial`.
                     *
                     * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
                     * builds, may be used as a placeholder for provided arguments.
                     *
                     * **Note:** This method doesn't set the "length" property of curried functions.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Function
                     * @param {Function} func The function to curry.
                     * @param {number} [arity=func.length] The arity of `func`.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Function} Returns the new curried function.
                     * @example
                     *
                     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
                     *
                     * var curried = _.curryRight(abc);
                     *
                     * curried(3)(2)(1);
                     * // => [1, 2, 3]
                     *
                     * curried(2, 3)(1);
                     * // => [1, 2, 3]
                     *
                     * curried(1, 2, 3);
                     * // => [1, 2, 3]
                     *
                     * // Curried with placeholders.
                     * curried(3)(1, _)(2);
                     * // => [1, 2, 3]
                     */
                    function curryRight(func, arity, guard) {
                        arity = guard ? undefined : arity;
                        var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
                        result.placeholder = curryRight.placeholder;
                        return result;
                    }

                    /**
                     * Creates a debounced function that delays invoking `func` until after `wait`
                     * milliseconds have elapsed since the last time the debounced function was
                     * invoked. The debounced function comes with a `cancel` method to cancel
                     * delayed `func` invocations and a `flush` method to immediately invoke them.
                     * Provide `options` to indicate whether `func` should be invoked on the
                     * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
                     * with the last arguments provided to the debounced function. Subsequent
                     * calls to the debounced function return the result of the last `func`
                     * invocation.
                     *
                     * **Note:** If `leading` and `trailing` options are `true`, `func` is
                     * invoked on the trailing edge of the timeout only if the debounced function
                     * is invoked more than once during the `wait` timeout.
                     *
                     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
                     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
                     *
                     * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
                     * for details over the differences between `_.debounce` and `_.throttle`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {Function} func The function to debounce.
                     * @param {number} [wait=0] The number of milliseconds to delay.
                     * @param {Object} [options={}] The options object.
                     * @param {boolean} [options.leading=false]
                     *  Specify invoking on the leading edge of the timeout.
                     * @param {number} [options.maxWait]
                     *  The maximum time `func` is allowed to be delayed before it's invoked.
                     * @param {boolean} [options.trailing=true]
                     *  Specify invoking on the trailing edge of the timeout.
                     * @returns {Function} Returns the new debounced function.
                     * @example
                     *
                     * // Avoid costly calculations while the window size is in flux.
                     * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
                     *
                     * // Invoke `sendMail` when clicked, debouncing subsequent calls.
                     * jQuery(element).on('click', _.debounce(sendMail, 300, {
     *   'leading': true,
     *   'trailing': false
     * }));
                     *
                     * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
                     * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
                     * var source = new EventSource('/stream');
                     * jQuery(source).on('message', debounced);
                     *
                     * // Cancel the trailing debounced invocation.
                     * jQuery(window).on('popstate', debounced.cancel);
                     */
                    function debounce(func, wait, options) {
                        var lastArgs,
                            lastThis,
                            maxWait,
                            result,
                            timerId,
                            lastCallTime,
                            lastInvokeTime = 0,
                            leading = false,
                            maxing = false,
                            trailing = true;

                        if (typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        wait = toNumber(wait) || 0;
                        if (isObject(options)) {
                            leading = !!options.leading;
                            maxing = 'maxWait' in options;
                            maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
                            trailing = 'trailing' in options ? !!options.trailing : trailing;
                        }

                        function invokeFunc(time) {
                            var args = lastArgs,
                                thisArg = lastThis;

                            lastArgs = lastThis = undefined;
                            lastInvokeTime = time;
                            result = func.apply(thisArg, args);
                            return result;
                        }

                        function leadingEdge(time) {
                            // Reset any `maxWait` timer.
                            lastInvokeTime = time;
                            // Start the timer for the trailing edge.
                            timerId = setTimeout(timerExpired, wait);
                            // Invoke the leading edge.
                            return leading ? invokeFunc(time) : result;
                        }

                        function remainingWait(time) {
                            var timeSinceLastCall = time - lastCallTime,
                                timeSinceLastInvoke = time - lastInvokeTime,
                                result = wait - timeSinceLastCall;

                            return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;
                        }

                        function shouldInvoke(time) {
                            var timeSinceLastCall = time - lastCallTime,
                                timeSinceLastInvoke = time - lastInvokeTime;

                            // Either this is the first call, activity has stopped and we're at the
                            // trailing edge, the system time has gone backwards and we're treating
                            // it as the trailing edge, or we've hit the `maxWait` limit.
                            return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
                                (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
                        }

                        function timerExpired() {
                            var time = now();
                            if (shouldInvoke(time)) {
                                return trailingEdge(time);
                            }
                            // Restart the timer.
                            timerId = setTimeout(timerExpired, remainingWait(time));
                        }

                        function trailingEdge(time) {
                            timerId = undefined;

                            // Only invoke if we have `lastArgs` which means `func` has been
                            // debounced at least once.
                            if (trailing && lastArgs) {
                                return invokeFunc(time);
                            }
                            lastArgs = lastThis = undefined;
                            return result;
                        }

                        function cancel() {
                            if (timerId !== undefined) {
                                clearTimeout(timerId);
                            }
                            lastInvokeTime = 0;
                            lastArgs = lastCallTime = lastThis = timerId = undefined;
                        }

                        function flush() {
                            return timerId === undefined ? result : trailingEdge(now());
                        }

                        function debounced() {
                            var time = now(),
                                isInvoking = shouldInvoke(time);

                            lastArgs = arguments;
                            lastThis = this;
                            lastCallTime = time;

                            if (isInvoking) {
                                if (timerId === undefined) {
                                    return leadingEdge(lastCallTime);
                                }
                                if (maxing) {
                                    // Handle invocations in a tight loop.
                                    timerId = setTimeout(timerExpired, wait);
                                    return invokeFunc(lastCallTime);
                                }
                            }
                            if (timerId === undefined) {
                                timerId = setTimeout(timerExpired, wait);
                            }
                            return result;
                        }
                        debounced.cancel = cancel;
                        debounced.flush = flush;
                        return debounced;
                    }

                    /**
                     * Defers invoking the `func` until the current call stack has cleared. Any
                     * additional arguments are provided to `func` when it's invoked.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {Function} func The function to defer.
                     * @param {...*} [args] The arguments to invoke `func` with.
                     * @returns {number} Returns the timer id.
                     * @example
                     *
                     * _.defer(function(text) {
     *   console.log(text);
     * }, 'deferred');
                     * // => Logs 'deferred' after one millisecond.
                     */
                    var defer = baseRest(function(func, args) {
                        return baseDelay(func, 1, args);
                    });

                    /**
                     * Invokes `func` after `wait` milliseconds. Any additional arguments are
                     * provided to `func` when it's invoked.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {Function} func The function to delay.
                     * @param {number} wait The number of milliseconds to delay invocation.
                     * @param {...*} [args] The arguments to invoke `func` with.
                     * @returns {number} Returns the timer id.
                     * @example
                     *
                     * _.delay(function(text) {
     *   console.log(text);
     * }, 1000, 'later');
                     * // => Logs 'later' after one second.
                     */
                    var delay = baseRest(function(func, wait, args) {
                        return baseDelay(func, toNumber(wait) || 0, args);
                    });

                    /**
                     * Creates a function that invokes `func` with arguments reversed.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Function
                     * @param {Function} func The function to flip arguments for.
                     * @returns {Function} Returns the new flipped function.
                     * @example
                     *
                     * var flipped = _.flip(function() {
     *   return _.toArray(arguments);
     * });
                     *
                     * flipped('a', 'b', 'c', 'd');
                     * // => ['d', 'c', 'b', 'a']
                     */
                    function flip(func) {
                        return createWrap(func, WRAP_FLIP_FLAG);
                    }

                    /**
                     * Creates a function that memoizes the result of `func`. If `resolver` is
                     * provided, it determines the cache key for storing the result based on the
                     * arguments provided to the memoized function. By default, the first argument
                     * provided to the memoized function is used as the map cache key. The `func`
                     * is invoked with the `this` binding of the memoized function.
                     *
                     * **Note:** The cache is exposed as the `cache` property on the memoized
                     * function. Its creation may be customized by replacing the `_.memoize.Cache`
                     * constructor with one whose instances implement the
                     * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
                     * method interface of `clear`, `delete`, `get`, `has`, and `set`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {Function} func The function to have its output memoized.
                     * @param {Function} [resolver] The function to resolve the cache key.
                     * @returns {Function} Returns the new memoized function.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': 2 };
                     * var other = { 'c': 3, 'd': 4 };
                     *
                     * var values = _.memoize(_.values);
                     * values(object);
                     * // => [1, 2]
                     *
                     * values(other);
                     * // => [3, 4]
                     *
                     * object.a = 2;
                     * values(object);
                     * // => [1, 2]
                     *
                     * // Modify the result cache.
                     * values.cache.set(object, ['a', 'b']);
                     * values(object);
                     * // => ['a', 'b']
                     *
                     * // Replace `_.memoize.Cache`.
                     * _.memoize.Cache = WeakMap;
                     */
                    function memoize(func, resolver) {
                        if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        var memoized = function() {
                            var args = arguments,
                                key = resolver ? resolver.apply(this, args) : args[0],
                                cache = memoized.cache;

                            if (cache.has(key)) {
                                return cache.get(key);
                            }
                            var result = func.apply(this, args);
                            memoized.cache = cache.set(key, result) || cache;
                            return result;
                        };
                        memoized.cache = new (memoize.Cache || MapCache);
                        return memoized;
                    }

                    // Expose `MapCache`.
                    memoize.Cache = MapCache;

                    /**
                     * Creates a function that negates the result of the predicate `func`. The
                     * `func` predicate is invoked with the `this` binding and arguments of the
                     * created function.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Function
                     * @param {Function} predicate The predicate to negate.
                     * @returns {Function} Returns the new negated function.
                     * @example
                     *
                     * function isEven(n) {
     *   return n % 2 == 0;
     * }
                     *
                     * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
                     * // => [1, 3, 5]
                     */
                    function negate(predicate) {
                        if (typeof predicate != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        return function() {
                            var args = arguments;
                            switch (args.length) {
                                case 0: return !predicate.call(this);
                                case 1: return !predicate.call(this, args[0]);
                                case 2: return !predicate.call(this, args[0], args[1]);
                                case 3: return !predicate.call(this, args[0], args[1], args[2]);
                            }
                            return !predicate.apply(this, args);
                        };
                    }

                    /**
                     * Creates a function that is restricted to invoking `func` once. Repeat calls
                     * to the function return the value of the first invocation. The `func` is
                     * invoked with the `this` binding and arguments of the created function.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {Function} func The function to restrict.
                     * @returns {Function} Returns the new restricted function.
                     * @example
                     *
                     * var initialize = _.once(createApplication);
                     * initialize();
                     * initialize();
                     * // => `createApplication` is invoked once
                     */
                    function once(func) {
                        return before(2, func);
                    }

                    /**
                     * Creates a function that invokes `func` with its arguments transformed.
                     *
                     * @static
                     * @since 4.0.0
                     * @memberOf _
                     * @category Function
                     * @param {Function} func The function to wrap.
                     * @param {...(Function|Function[])} [transforms=[_.identity]]
                     *  The argument transforms.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * function doubled(n) {
     *   return n * 2;
     * }
                     *
                     * function square(n) {
     *   return n * n;
     * }
                     *
                     * var func = _.overArgs(function(x, y) {
     *   return [x, y];
     * }, [square, doubled]);
                     *
                     * func(9, 3);
                     * // => [81, 6]
                     *
                     * func(10, 5);
                     * // => [100, 10]
                     */
                    var overArgs = castRest(function(func, transforms) {
                        transforms = (transforms.length == 1 && isArray(transforms[0]))
                            ? arrayMap(transforms[0], baseUnary(getIteratee()))
                            : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));

                        var funcsLength = transforms.length;
                        return baseRest(function(args) {
                            var index = -1,
                                length = nativeMin(args.length, funcsLength);

                            while (++index < length) {
                                args[index] = transforms[index].call(this, args[index]);
                            }
                            return apply(func, this, args);
                        });
                    });

                    /**
                     * Creates a function that invokes `func` with `partials` prepended to the
                     * arguments it receives. This method is like `_.bind` except it does **not**
                     * alter the `this` binding.
                     *
                     * The `_.partial.placeholder` value, which defaults to `_` in monolithic
                     * builds, may be used as a placeholder for partially applied arguments.
                     *
                     * **Note:** This method doesn't set the "length" property of partially
                     * applied functions.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.2.0
                     * @category Function
                     * @param {Function} func The function to partially apply arguments to.
                     * @param {...*} [partials] The arguments to be partially applied.
                     * @returns {Function} Returns the new partially applied function.
                     * @example
                     *
                     * function greet(greeting, name) {
     *   return greeting + ' ' + name;
     * }
                     *
                     * var sayHelloTo = _.partial(greet, 'hello');
                     * sayHelloTo('fred');
                     * // => 'hello fred'
                     *
                     * // Partially applied with placeholders.
                     * var greetFred = _.partial(greet, _, 'fred');
                     * greetFred('hi');
                     * // => 'hi fred'
                     */
                    var partial = baseRest(function(func, partials) {
                        var holders = replaceHolders(partials, getHolder(partial));
                        return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
                    });

                    /**
                     * This method is like `_.partial` except that partially applied arguments
                     * are appended to the arguments it receives.
                     *
                     * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
                     * builds, may be used as a placeholder for partially applied arguments.
                     *
                     * **Note:** This method doesn't set the "length" property of partially
                     * applied functions.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.0.0
                     * @category Function
                     * @param {Function} func The function to partially apply arguments to.
                     * @param {...*} [partials] The arguments to be partially applied.
                     * @returns {Function} Returns the new partially applied function.
                     * @example
                     *
                     * function greet(greeting, name) {
     *   return greeting + ' ' + name;
     * }
                     *
                     * var greetFred = _.partialRight(greet, 'fred');
                     * greetFred('hi');
                     * // => 'hi fred'
                     *
                     * // Partially applied with placeholders.
                     * var sayHelloTo = _.partialRight(greet, 'hello', _);
                     * sayHelloTo('fred');
                     * // => 'hello fred'
                     */
                    var partialRight = baseRest(function(func, partials) {
                        var holders = replaceHolders(partials, getHolder(partialRight));
                        return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
                    });

                    /**
                     * Creates a function that invokes `func` with arguments arranged according
                     * to the specified `indexes` where the argument value at the first index is
                     * provided as the first argument, the argument value at the second index is
                     * provided as the second argument, and so on.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Function
                     * @param {Function} func The function to rearrange arguments for.
                     * @param {...(number|number[])} indexes The arranged argument indexes.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * var rearged = _.rearg(function(a, b, c) {
     *   return [a, b, c];
     * }, [2, 0, 1]);
                     *
                     * rearged('b', 'c', 'a')
                     * // => ['a', 'b', 'c']
                     */
                    var rearg = flatRest(function(func, indexes) {
                        return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
                    });

                    /**
                     * Creates a function that invokes `func` with the `this` binding of the
                     * created function and arguments from `start` and beyond provided as
                     * an array.
                     *
                     * **Note:** This method is based on the
                     * [rest parameter](https://mdn.io/rest_parameters).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Function
                     * @param {Function} func The function to apply a rest parameter to.
                     * @param {number} [start=func.length-1] The start position of the rest parameter.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * var say = _.rest(function(what, names) {
     *   return what + ' ' + _.initial(names).join(', ') +
     *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
     * });
                     *
                     * say('hello', 'fred', 'barney', 'pebbles');
                     * // => 'hello fred, barney, & pebbles'
                     */
                    function rest(func, start) {
                        if (typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        start = start === undefined ? start : toInteger(start);
                        return baseRest(func, start);
                    }

                    /**
                     * Creates a function that invokes `func` with the `this` binding of the
                     * create function and an array of arguments much like
                     * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
                     *
                     * **Note:** This method is based on the
                     * [spread operator](https://mdn.io/spread_operator).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.2.0
                     * @category Function
                     * @param {Function} func The function to spread arguments over.
                     * @param {number} [start=0] The start position of the spread.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * var say = _.spread(function(who, what) {
     *   return who + ' says ' + what;
     * });
                     *
                     * say(['fred', 'hello']);
                     * // => 'fred says hello'
                     *
                     * var numbers = Promise.all([
                     *   Promise.resolve(40),
                     *   Promise.resolve(36)
                     * ]);
                     *
                     * numbers.then(_.spread(function(x, y) {
     *   return x + y;
     * }));
                     * // => a Promise of 76
                     */
                    function spread(func, start) {
                        if (typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        start = start == null ? 0 : nativeMax(toInteger(start), 0);
                        return baseRest(function(args) {
                            var array = args[start],
                                otherArgs = castSlice(args, 0, start);

                            if (array) {
                                arrayPush(otherArgs, array);
                            }
                            return apply(func, this, otherArgs);
                        });
                    }

                    /**
                     * Creates a throttled function that only invokes `func` at most once per
                     * every `wait` milliseconds. The throttled function comes with a `cancel`
                     * method to cancel delayed `func` invocations and a `flush` method to
                     * immediately invoke them. Provide `options` to indicate whether `func`
                     * should be invoked on the leading and/or trailing edge of the `wait`
                     * timeout. The `func` is invoked with the last arguments provided to the
                     * throttled function. Subsequent calls to the throttled function return the
                     * result of the last `func` invocation.
                     *
                     * **Note:** If `leading` and `trailing` options are `true`, `func` is
                     * invoked on the trailing edge of the timeout only if the throttled function
                     * is invoked more than once during the `wait` timeout.
                     *
                     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
                     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
                     *
                     * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
                     * for details over the differences between `_.throttle` and `_.debounce`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {Function} func The function to throttle.
                     * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
                     * @param {Object} [options={}] The options object.
                     * @param {boolean} [options.leading=true]
                     *  Specify invoking on the leading edge of the timeout.
                     * @param {boolean} [options.trailing=true]
                     *  Specify invoking on the trailing edge of the timeout.
                     * @returns {Function} Returns the new throttled function.
                     * @example
                     *
                     * // Avoid excessively updating the position while scrolling.
                     * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
                     *
                     * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
                     * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
                     * jQuery(element).on('click', throttled);
                     *
                     * // Cancel the trailing throttled invocation.
                     * jQuery(window).on('popstate', throttled.cancel);
                     */
                    function throttle(func, wait, options) {
                        var leading = true,
                            trailing = true;

                        if (typeof func != 'function') {
                            throw new TypeError(FUNC_ERROR_TEXT);
                        }
                        if (isObject(options)) {
                            leading = 'leading' in options ? !!options.leading : leading;
                            trailing = 'trailing' in options ? !!options.trailing : trailing;
                        }
                        return debounce(func, wait, {
                            'leading': leading,
                            'maxWait': wait,
                            'trailing': trailing
                        });
                    }

                    /**
                     * Creates a function that accepts up to one argument, ignoring any
                     * additional arguments.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Function
                     * @param {Function} func The function to cap arguments for.
                     * @returns {Function} Returns the new capped function.
                     * @example
                     *
                     * _.map(['6', '8', '10'], _.unary(parseInt));
                     * // => [6, 8, 10]
                     */
                    function unary(func) {
                        return ary(func, 1);
                    }

                    /**
                     * Creates a function that provides `value` to `wrapper` as its first
                     * argument. Any additional arguments provided to the function are appended
                     * to those provided to the `wrapper`. The wrapper is invoked with the `this`
                     * binding of the created function.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Function
                     * @param {*} value The value to wrap.
                     * @param {Function} [wrapper=identity] The wrapper function.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * var p = _.wrap(_.escape, function(func, text) {
     *   return '<p>' + func(text) + '</p>';
     * });
                     *
                     * p('fred, barney, & pebbles');
                     * // => '<p>fred, barney, &amp; pebbles</p>'
                     */
                    function wrap(value, wrapper) {
                        return partial(castFunction(wrapper), value);
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Casts `value` as an array if it's not one.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.4.0
                     * @category Lang
                     * @param {*} value The value to inspect.
                     * @returns {Array} Returns the cast array.
                     * @example
                     *
                     * _.castArray(1);
                     * // => [1]
                     *
                     * _.castArray({ 'a': 1 });
                     * // => [{ 'a': 1 }]
                     *
                     * _.castArray('abc');
                     * // => ['abc']
                     *
                     * _.castArray(null);
                     * // => [null]
                     *
                     * _.castArray(undefined);
                     * // => [undefined]
                     *
                     * _.castArray();
                     * // => []
                     *
                     * var array = [1, 2, 3];
                     * console.log(_.castArray(array) === array);
                     * // => true
                     */
                    function castArray() {
                        if (!arguments.length) {
                            return [];
                        }
                        var value = arguments[0];
                        return isArray(value) ? value : [value];
                    }

                    /**
                     * Creates a shallow clone of `value`.
                     *
                     * **Note:** This method is loosely based on the
                     * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
                     * and supports cloning arrays, array buffers, booleans, date objects, maps,
                     * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
                     * arrays. The own enumerable properties of `arguments` objects are cloned
                     * as plain objects. An empty object is returned for uncloneable values such
                     * as error objects, functions, DOM nodes, and WeakMaps.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to clone.
                     * @returns {*} Returns the cloned value.
                     * @see _.cloneDeep
                     * @example
                     *
                     * var objects = [{ 'a': 1 }, { 'b': 2 }];
                     *
                     * var shallow = _.clone(objects);
                     * console.log(shallow[0] === objects[0]);
                     * // => true
                     */
                    function clone(value) {
                        return baseClone(value, CLONE_SYMBOLS_FLAG);
                    }

                    /**
                     * This method is like `_.clone` except that it accepts `customizer` which
                     * is invoked to produce the cloned value. If `customizer` returns `undefined`,
                     * cloning is handled by the method instead. The `customizer` is invoked with
                     * up to four arguments; (value [, index|key, object, stack]).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to clone.
                     * @param {Function} [customizer] The function to customize cloning.
                     * @returns {*} Returns the cloned value.
                     * @see _.cloneDeepWith
                     * @example
                     *
                     * function customizer(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(false);
     *   }
     * }
                     *
                     * var el = _.cloneWith(document.body, customizer);
                     *
                     * console.log(el === document.body);
                     * // => false
                     * console.log(el.nodeName);
                     * // => 'BODY'
                     * console.log(el.childNodes.length);
                     * // => 0
                     */
                    function cloneWith(value, customizer) {
                        customizer = typeof customizer == 'function' ? customizer : undefined;
                        return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
                    }

                    /**
                     * This method is like `_.clone` except that it recursively clones `value`.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.0.0
                     * @category Lang
                     * @param {*} value The value to recursively clone.
                     * @returns {*} Returns the deep cloned value.
                     * @see _.clone
                     * @example
                     *
                     * var objects = [{ 'a': 1 }, { 'b': 2 }];
                     *
                     * var deep = _.cloneDeep(objects);
                     * console.log(deep[0] === objects[0]);
                     * // => false
                     */
                    function cloneDeep(value) {
                        return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
                    }

                    /**
                     * This method is like `_.cloneWith` except that it recursively clones `value`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to recursively clone.
                     * @param {Function} [customizer] The function to customize cloning.
                     * @returns {*} Returns the deep cloned value.
                     * @see _.cloneWith
                     * @example
                     *
                     * function customizer(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(true);
     *   }
     * }
                     *
                     * var el = _.cloneDeepWith(document.body, customizer);
                     *
                     * console.log(el === document.body);
                     * // => false
                     * console.log(el.nodeName);
                     * // => 'BODY'
                     * console.log(el.childNodes.length);
                     * // => 20
                     */
                    function cloneDeepWith(value, customizer) {
                        customizer = typeof customizer == 'function' ? customizer : undefined;
                        return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
                    }

                    /**
                     * Checks if `object` conforms to `source` by invoking the predicate
                     * properties of `source` with the corresponding property values of `object`.
                     *
                     * **Note:** This method is equivalent to `_.conforms` when `source` is
                     * partially applied.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.14.0
                     * @category Lang
                     * @param {Object} object The object to inspect.
                     * @param {Object} source The object of property predicates to conform to.
                     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': 2 };
                     *
                     * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
                     * // => true
                     *
                     * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
                     * // => false
                     */
                    function conformsTo(object, source) {
                        return source == null || baseConformsTo(object, source, keys(source));
                    }

                    /**
                     * Performs a
                     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
                     * comparison between two values to determine if they are equivalent.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
                     * @example
                     *
                     * var object = { 'a': 1 };
                     * var other = { 'a': 1 };
                     *
                     * _.eq(object, object);
                     * // => true
                     *
                     * _.eq(object, other);
                     * // => false
                     *
                     * _.eq('a', 'a');
                     * // => true
                     *
                     * _.eq('a', Object('a'));
                     * // => false
                     *
                     * _.eq(NaN, NaN);
                     * // => true
                     */
                    function eq(value, other) {
                        return value === other || (value !== value && other !== other);
                    }

                    /**
                     * Checks if `value` is greater than `other`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.9.0
                     * @category Lang
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if `value` is greater than `other`,
                     *  else `false`.
                     * @see _.lt
                     * @example
                     *
                     * _.gt(3, 1);
                     * // => true
                     *
                     * _.gt(3, 3);
                     * // => false
                     *
                     * _.gt(1, 3);
                     * // => false
                     */
                    var gt = createRelationalOperation(baseGt);

                    /**
                     * Checks if `value` is greater than or equal to `other`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.9.0
                     * @category Lang
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if `value` is greater than or equal to
                     *  `other`, else `false`.
                     * @see _.lte
                     * @example
                     *
                     * _.gte(3, 1);
                     * // => true
                     *
                     * _.gte(3, 3);
                     * // => true
                     *
                     * _.gte(1, 3);
                     * // => false
                     */
                    var gte = createRelationalOperation(function(value, other) {
                        return value >= other;
                    });

                    /**
                     * Checks if `value` is likely an `arguments` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
                     *  else `false`.
                     * @example
                     *
                     * _.isArguments(function() { return arguments; }());
                     * // => true
                     *
                     * _.isArguments([1, 2, 3]);
                     * // => false
                     */
                    var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
                        return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
                            !propertyIsEnumerable.call(value, 'callee');
                    };

                    /**
                     * Checks if `value` is classified as an `Array` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an array, else `false`.
                     * @example
                     *
                     * _.isArray([1, 2, 3]);
                     * // => true
                     *
                     * _.isArray(document.body.children);
                     * // => false
                     *
                     * _.isArray('abc');
                     * // => false
                     *
                     * _.isArray(_.noop);
                     * // => false
                     */
                    var isArray = Array.isArray;

                    /**
                     * Checks if `value` is classified as an `ArrayBuffer` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.3.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
                     * @example
                     *
                     * _.isArrayBuffer(new ArrayBuffer(2));
                     * // => true
                     *
                     * _.isArrayBuffer(new Array(2));
                     * // => false
                     */
                    var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;

                    /**
                     * Checks if `value` is array-like. A value is considered array-like if it's
                     * not a function and has a `value.length` that's an integer greater than or
                     * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
                     * @example
                     *
                     * _.isArrayLike([1, 2, 3]);
                     * // => true
                     *
                     * _.isArrayLike(document.body.children);
                     * // => true
                     *
                     * _.isArrayLike('abc');
                     * // => true
                     *
                     * _.isArrayLike(_.noop);
                     * // => false
                     */
                    function isArrayLike(value) {
                        return value != null && isLength(value.length) && !isFunction(value);
                    }

                    /**
                     * This method is like `_.isArrayLike` except that it also checks if `value`
                     * is an object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an array-like object,
                     *  else `false`.
                     * @example
                     *
                     * _.isArrayLikeObject([1, 2, 3]);
                     * // => true
                     *
                     * _.isArrayLikeObject(document.body.children);
                     * // => true
                     *
                     * _.isArrayLikeObject('abc');
                     * // => false
                     *
                     * _.isArrayLikeObject(_.noop);
                     * // => false
                     */
                    function isArrayLikeObject(value) {
                        return isObjectLike(value) && isArrayLike(value);
                    }

                    /**
                     * Checks if `value` is classified as a boolean primitive or object.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
                     * @example
                     *
                     * _.isBoolean(false);
                     * // => true
                     *
                     * _.isBoolean(null);
                     * // => false
                     */
                    function isBoolean(value) {
                        return value === true || value === false ||
                            (isObjectLike(value) && baseGetTag(value) == boolTag);
                    }

                    /**
                     * Checks if `value` is a buffer.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.3.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
                     * @example
                     *
                     * _.isBuffer(new Buffer(2));
                     * // => true
                     *
                     * _.isBuffer(new Uint8Array(2));
                     * // => false
                     */
                    var isBuffer = nativeIsBuffer || stubFalse;

                    /**
                     * Checks if `value` is classified as a `Date` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
                     * @example
                     *
                     * _.isDate(new Date);
                     * // => true
                     *
                     * _.isDate('Mon April 23 2012');
                     * // => false
                     */
                    var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;

                    /**
                     * Checks if `value` is likely a DOM element.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
                     * @example
                     *
                     * _.isElement(document.body);
                     * // => true
                     *
                     * _.isElement('<body>');
                     * // => false
                     */
                    function isElement(value) {
                        return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
                    }

                    /**
                     * Checks if `value` is an empty object, collection, map, or set.
                     *
                     * Objects are considered empty if they have no own enumerable string keyed
                     * properties.
                     *
                     * Array-like values such as `arguments` objects, arrays, buffers, strings, or
                     * jQuery-like collections are considered empty if they have a `length` of `0`.
                     * Similarly, maps and sets are considered empty if they have a `size` of `0`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is empty, else `false`.
                     * @example
                     *
                     * _.isEmpty(null);
                     * // => true
                     *
                     * _.isEmpty(true);
                     * // => true
                     *
                     * _.isEmpty(1);
                     * // => true
                     *
                     * _.isEmpty([1, 2, 3]);
                     * // => false
                     *
                     * _.isEmpty({ 'a': 1 });
                     * // => false
                     */
                    function isEmpty(value) {
                        if (value == null) {
                            return true;
                        }
                        if (isArrayLike(value) &&
                            (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
                                isBuffer(value) || isTypedArray(value) || isArguments(value))) {
                            return !value.length;
                        }
                        var tag = getTag(value);
                        if (tag == mapTag || tag == setTag) {
                            return !value.size;
                        }
                        if (isPrototype(value)) {
                            return !baseKeys(value).length;
                        }
                        for (var key in value) {
                            if (hasOwnProperty.call(value, key)) {
                                return false;
                            }
                        }
                        return true;
                    }

                    /**
                     * Performs a deep comparison between two values to determine if they are
                     * equivalent.
                     *
                     * **Note:** This method supports comparing arrays, array buffers, booleans,
                     * date objects, error objects, maps, numbers, `Object` objects, regexes,
                     * sets, strings, symbols, and typed arrays. `Object` objects are compared
                     * by their own, not inherited, enumerable properties. Functions and DOM
                     * nodes are compared by strict equality, i.e. `===`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
                     * @example
                     *
                     * var object = { 'a': 1 };
                     * var other = { 'a': 1 };
                     *
                     * _.isEqual(object, other);
                     * // => true
                     *
                     * object === other;
                     * // => false
                     */
                    function isEqual(value, other) {
                        return baseIsEqual(value, other);
                    }

                    /**
                     * This method is like `_.isEqual` except that it accepts `customizer` which
                     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
                     * are handled by the method instead. The `customizer` is invoked with up to
                     * six arguments: (objValue, othValue [, index|key, object, other, stack]).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @param {Function} [customizer] The function to customize comparisons.
                     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
                     * @example
                     *
                     * function isGreeting(value) {
     *   return /^h(?:i|ello)$/.test(value);
     * }
                     *
                     * function customizer(objValue, othValue) {
     *   if (isGreeting(objValue) && isGreeting(othValue)) {
     *     return true;
     *   }
     * }
                     *
                     * var array = ['hello', 'goodbye'];
                     * var other = ['hi', 'goodbye'];
                     *
                     * _.isEqualWith(array, other, customizer);
                     * // => true
                     */
                    function isEqualWith(value, other, customizer) {
                        customizer = typeof customizer == 'function' ? customizer : undefined;
                        var result = customizer ? customizer(value, other) : undefined;
                        return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
                    }

                    /**
                     * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
                     * `SyntaxError`, `TypeError`, or `URIError` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
                     * @example
                     *
                     * _.isError(new Error);
                     * // => true
                     *
                     * _.isError(Error);
                     * // => false
                     */
                    function isError(value) {
                        if (!isObjectLike(value)) {
                            return false;
                        }
                        var tag = baseGetTag(value);
                        return tag == errorTag || tag == domExcTag ||
                            (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
                    }

                    /**
                     * Checks if `value` is a finite primitive number.
                     *
                     * **Note:** This method is based on
                     * [`Number.isFinite`](https://mdn.io/Number/isFinite).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
                     * @example
                     *
                     * _.isFinite(3);
                     * // => true
                     *
                     * _.isFinite(Number.MIN_VALUE);
                     * // => true
                     *
                     * _.isFinite(Infinity);
                     * // => false
                     *
                     * _.isFinite('3');
                     * // => false
                     */
                    function isFinite(value) {
                        return typeof value == 'number' && nativeIsFinite(value);
                    }

                    /**
                     * Checks if `value` is classified as a `Function` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a function, else `false`.
                     * @example
                     *
                     * _.isFunction(_);
                     * // => true
                     *
                     * _.isFunction(/abc/);
                     * // => false
                     */
                    function isFunction(value) {
                        if (!isObject(value)) {
                            return false;
                        }
                        // The use of `Object#toString` avoids issues with the `typeof` operator
                        // in Safari 9 which returns 'object' for typed arrays and other constructors.
                        var tag = baseGetTag(value);
                        return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
                    }

                    /**
                     * Checks if `value` is an integer.
                     *
                     * **Note:** This method is based on
                     * [`Number.isInteger`](https://mdn.io/Number/isInteger).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
                     * @example
                     *
                     * _.isInteger(3);
                     * // => true
                     *
                     * _.isInteger(Number.MIN_VALUE);
                     * // => false
                     *
                     * _.isInteger(Infinity);
                     * // => false
                     *
                     * _.isInteger('3');
                     * // => false
                     */
                    function isInteger(value) {
                        return typeof value == 'number' && value == toInteger(value);
                    }

                    /**
                     * Checks if `value` is a valid array-like length.
                     *
                     * **Note:** This method is loosely based on
                     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
                     * @example
                     *
                     * _.isLength(3);
                     * // => true
                     *
                     * _.isLength(Number.MIN_VALUE);
                     * // => false
                     *
                     * _.isLength(Infinity);
                     * // => false
                     *
                     * _.isLength('3');
                     * // => false
                     */
                    function isLength(value) {
                        return typeof value == 'number' &&
                            value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
                    }

                    /**
                     * Checks if `value` is the
                     * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
                     * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is an object, else `false`.
                     * @example
                     *
                     * _.isObject({});
                     * // => true
                     *
                     * _.isObject([1, 2, 3]);
                     * // => true
                     *
                     * _.isObject(_.noop);
                     * // => true
                     *
                     * _.isObject(null);
                     * // => false
                     */
                    function isObject(value) {
                        var type = typeof value;
                        return value != null && (type == 'object' || type == 'function');
                    }

                    /**
                     * Checks if `value` is object-like. A value is object-like if it's not `null`
                     * and has a `typeof` result of "object".
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
                     * @example
                     *
                     * _.isObjectLike({});
                     * // => true
                     *
                     * _.isObjectLike([1, 2, 3]);
                     * // => true
                     *
                     * _.isObjectLike(_.noop);
                     * // => false
                     *
                     * _.isObjectLike(null);
                     * // => false
                     */
                    function isObjectLike(value) {
                        return value != null && typeof value == 'object';
                    }

                    /**
                     * Checks if `value` is classified as a `Map` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.3.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
                     * @example
                     *
                     * _.isMap(new Map);
                     * // => true
                     *
                     * _.isMap(new WeakMap);
                     * // => false
                     */
                    var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;

                    /**
                     * Performs a partial deep comparison between `object` and `source` to
                     * determine if `object` contains equivalent property values.
                     *
                     * **Note:** This method is equivalent to `_.matches` when `source` is
                     * partially applied.
                     *
                     * Partial comparisons will match empty array and empty object `source`
                     * values against any array or object value, respectively. See `_.isEqual`
                     * for a list of supported value comparisons.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Lang
                     * @param {Object} object The object to inspect.
                     * @param {Object} source The object of property values to match.
                     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': 2 };
                     *
                     * _.isMatch(object, { 'b': 2 });
                     * // => true
                     *
                     * _.isMatch(object, { 'b': 1 });
                     * // => false
                     */
                    function isMatch(object, source) {
                        return object === source || baseIsMatch(object, source, getMatchData(source));
                    }

                    /**
                     * This method is like `_.isMatch` except that it accepts `customizer` which
                     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
                     * are handled by the method instead. The `customizer` is invoked with five
                     * arguments: (objValue, srcValue, index|key, object, source).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {Object} object The object to inspect.
                     * @param {Object} source The object of property values to match.
                     * @param {Function} [customizer] The function to customize comparisons.
                     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
                     * @example
                     *
                     * function isGreeting(value) {
     *   return /^h(?:i|ello)$/.test(value);
     * }
                     *
                     * function customizer(objValue, srcValue) {
     *   if (isGreeting(objValue) && isGreeting(srcValue)) {
     *     return true;
     *   }
     * }
                     *
                     * var object = { 'greeting': 'hello' };
                     * var source = { 'greeting': 'hi' };
                     *
                     * _.isMatchWith(object, source, customizer);
                     * // => true
                     */
                    function isMatchWith(object, source, customizer) {
                        customizer = typeof customizer == 'function' ? customizer : undefined;
                        return baseIsMatch(object, source, getMatchData(source), customizer);
                    }

                    /**
                     * Checks if `value` is `NaN`.
                     *
                     * **Note:** This method is based on
                     * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
                     * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
                     * `undefined` and other non-number values.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
                     * @example
                     *
                     * _.isNaN(NaN);
                     * // => true
                     *
                     * _.isNaN(new Number(NaN));
                     * // => true
                     *
                     * isNaN(undefined);
                     * // => true
                     *
                     * _.isNaN(undefined);
                     * // => false
                     */
                    function isNaN(value) {
                        // An `NaN` primitive is the only value that is not equal to itself.
                        // Perform the `toStringTag` check first to avoid errors with some
                        // ActiveX objects in IE.
                        return isNumber(value) && value != +value;
                    }

                    /**
                     * Checks if `value` is a pristine native function.
                     *
                     * **Note:** This method can't reliably detect native functions in the presence
                     * of the core-js package because core-js circumvents this kind of detection.
                     * Despite multiple requests, the core-js maintainer has made it clear: any
                     * attempt to fix the detection will be obstructed. As a result, we're left
                     * with little choice but to throw an error. Unfortunately, this also affects
                     * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
                     * which rely on core-js.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a native function,
                     *  else `false`.
                     * @example
                     *
                     * _.isNative(Array.prototype.push);
                     * // => true
                     *
                     * _.isNative(_);
                     * // => false
                     */
                    function isNative(value) {
                        if (isMaskable(value)) {
                            throw new Error(CORE_ERROR_TEXT);
                        }
                        return baseIsNative(value);
                    }

                    /**
                     * Checks if `value` is `null`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
                     * @example
                     *
                     * _.isNull(null);
                     * // => true
                     *
                     * _.isNull(void 0);
                     * // => false
                     */
                    function isNull(value) {
                        return value === null;
                    }

                    /**
                     * Checks if `value` is `null` or `undefined`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
                     * @example
                     *
                     * _.isNil(null);
                     * // => true
                     *
                     * _.isNil(void 0);
                     * // => true
                     *
                     * _.isNil(NaN);
                     * // => false
                     */
                    function isNil(value) {
                        return value == null;
                    }

                    /**
                     * Checks if `value` is classified as a `Number` primitive or object.
                     *
                     * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
                     * classified as numbers, use the `_.isFinite` method.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a number, else `false`.
                     * @example
                     *
                     * _.isNumber(3);
                     * // => true
                     *
                     * _.isNumber(Number.MIN_VALUE);
                     * // => true
                     *
                     * _.isNumber(Infinity);
                     * // => true
                     *
                     * _.isNumber('3');
                     * // => false
                     */
                    function isNumber(value) {
                        return typeof value == 'number' ||
                            (isObjectLike(value) && baseGetTag(value) == numberTag);
                    }

                    /**
                     * Checks if `value` is a plain object, that is, an object created by the
                     * `Object` constructor or one with a `[[Prototype]]` of `null`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.8.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     * }
                     *
                     * _.isPlainObject(new Foo);
                     * // => false
                     *
                     * _.isPlainObject([1, 2, 3]);
                     * // => false
                     *
                     * _.isPlainObject({ 'x': 0, 'y': 0 });
                     * // => true
                     *
                     * _.isPlainObject(Object.create(null));
                     * // => true
                     */
                    function isPlainObject(value) {
                        if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
                            return false;
                        }
                        var proto = getPrototype(value);
                        if (proto === null) {
                            return true;
                        }
                        var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
                        return typeof Ctor == 'function' && Ctor instanceof Ctor &&
                            funcToString.call(Ctor) == objectCtorString;
                    }

                    /**
                     * Checks if `value` is classified as a `RegExp` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.1.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
                     * @example
                     *
                     * _.isRegExp(/abc/);
                     * // => true
                     *
                     * _.isRegExp('/abc/');
                     * // => false
                     */
                    var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;

                    /**
                     * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
                     * double precision number which isn't the result of a rounded unsafe integer.
                     *
                     * **Note:** This method is based on
                     * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
                     * @example
                     *
                     * _.isSafeInteger(3);
                     * // => true
                     *
                     * _.isSafeInteger(Number.MIN_VALUE);
                     * // => false
                     *
                     * _.isSafeInteger(Infinity);
                     * // => false
                     *
                     * _.isSafeInteger('3');
                     * // => false
                     */
                    function isSafeInteger(value) {
                        return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
                    }

                    /**
                     * Checks if `value` is classified as a `Set` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.3.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
                     * @example
                     *
                     * _.isSet(new Set);
                     * // => true
                     *
                     * _.isSet(new WeakSet);
                     * // => false
                     */
                    var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;

                    /**
                     * Checks if `value` is classified as a `String` primitive or object.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a string, else `false`.
                     * @example
                     *
                     * _.isString('abc');
                     * // => true
                     *
                     * _.isString(1);
                     * // => false
                     */
                    function isString(value) {
                        return typeof value == 'string' ||
                            (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
                    }

                    /**
                     * Checks if `value` is classified as a `Symbol` primitive or object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
                     * @example
                     *
                     * _.isSymbol(Symbol.iterator);
                     * // => true
                     *
                     * _.isSymbol('abc');
                     * // => false
                     */
                    function isSymbol(value) {
                        return typeof value == 'symbol' ||
                            (isObjectLike(value) && baseGetTag(value) == symbolTag);
                    }

                    /**
                     * Checks if `value` is classified as a typed array.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
                     * @example
                     *
                     * _.isTypedArray(new Uint8Array);
                     * // => true
                     *
                     * _.isTypedArray([]);
                     * // => false
                     */
                    var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;

                    /**
                     * Checks if `value` is `undefined`.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
                     * @example
                     *
                     * _.isUndefined(void 0);
                     * // => true
                     *
                     * _.isUndefined(null);
                     * // => false
                     */
                    function isUndefined(value) {
                        return value === undefined;
                    }

                    /**
                     * Checks if `value` is classified as a `WeakMap` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.3.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
                     * @example
                     *
                     * _.isWeakMap(new WeakMap);
                     * // => true
                     *
                     * _.isWeakMap(new Map);
                     * // => false
                     */
                    function isWeakMap(value) {
                        return isObjectLike(value) && getTag(value) == weakMapTag;
                    }

                    /**
                     * Checks if `value` is classified as a `WeakSet` object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.3.0
                     * @category Lang
                     * @param {*} value The value to check.
                     * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
                     * @example
                     *
                     * _.isWeakSet(new WeakSet);
                     * // => true
                     *
                     * _.isWeakSet(new Set);
                     * // => false
                     */
                    function isWeakSet(value) {
                        return isObjectLike(value) && baseGetTag(value) == weakSetTag;
                    }

                    /**
                     * Checks if `value` is less than `other`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.9.0
                     * @category Lang
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if `value` is less than `other`,
                     *  else `false`.
                     * @see _.gt
                     * @example
                     *
                     * _.lt(1, 3);
                     * // => true
                     *
                     * _.lt(3, 3);
                     * // => false
                     *
                     * _.lt(3, 1);
                     * // => false
                     */
                    var lt = createRelationalOperation(baseLt);

                    /**
                     * Checks if `value` is less than or equal to `other`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.9.0
                     * @category Lang
                     * @param {*} value The value to compare.
                     * @param {*} other The other value to compare.
                     * @returns {boolean} Returns `true` if `value` is less than or equal to
                     *  `other`, else `false`.
                     * @see _.gte
                     * @example
                     *
                     * _.lte(1, 3);
                     * // => true
                     *
                     * _.lte(3, 3);
                     * // => true
                     *
                     * _.lte(3, 1);
                     * // => false
                     */
                    var lte = createRelationalOperation(function(value, other) {
                        return value <= other;
                    });

                    /**
                     * Converts `value` to an array.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Lang
                     * @param {*} value The value to convert.
                     * @returns {Array} Returns the converted array.
                     * @example
                     *
                     * _.toArray({ 'a': 1, 'b': 2 });
                     * // => [1, 2]
                     *
                     * _.toArray('abc');
                     * // => ['a', 'b', 'c']
                     *
                     * _.toArray(1);
                     * // => []
                     *
                     * _.toArray(null);
                     * // => []
                     */
                    function toArray(value) {
                        if (!value) {
                            return [];
                        }
                        if (isArrayLike(value)) {
                            return isString(value) ? stringToArray(value) : copyArray(value);
                        }
                        if (symIterator && value[symIterator]) {
                            return iteratorToArray(value[symIterator]());
                        }
                        var tag = getTag(value),
                            func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);

                        return func(value);
                    }

                    /**
                     * Converts `value` to a finite number.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.12.0
                     * @category Lang
                     * @param {*} value The value to convert.
                     * @returns {number} Returns the converted number.
                     * @example
                     *
                     * _.toFinite(3.2);
                     * // => 3.2
                     *
                     * _.toFinite(Number.MIN_VALUE);
                     * // => 5e-324
                     *
                     * _.toFinite(Infinity);
                     * // => 1.7976931348623157e+308
                     *
                     * _.toFinite('3.2');
                     * // => 3.2
                     */
                    function toFinite(value) {
                        if (!value) {
                            return value === 0 ? value : 0;
                        }
                        value = toNumber(value);
                        if (value === INFINITY || value === -INFINITY) {
                            var sign = (value < 0 ? -1 : 1);
                            return sign * MAX_INTEGER;
                        }
                        return value === value ? value : 0;
                    }

                    /**
                     * Converts `value` to an integer.
                     *
                     * **Note:** This method is loosely based on
                     * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to convert.
                     * @returns {number} Returns the converted integer.
                     * @example
                     *
                     * _.toInteger(3.2);
                     * // => 3
                     *
                     * _.toInteger(Number.MIN_VALUE);
                     * // => 0
                     *
                     * _.toInteger(Infinity);
                     * // => 1.7976931348623157e+308
                     *
                     * _.toInteger('3.2');
                     * // => 3
                     */
                    function toInteger(value) {
                        var result = toFinite(value),
                            remainder = result % 1;

                        return result === result ? (remainder ? result - remainder : result) : 0;
                    }

                    /**
                     * Converts `value` to an integer suitable for use as the length of an
                     * array-like object.
                     *
                     * **Note:** This method is based on
                     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to convert.
                     * @returns {number} Returns the converted integer.
                     * @example
                     *
                     * _.toLength(3.2);
                     * // => 3
                     *
                     * _.toLength(Number.MIN_VALUE);
                     * // => 0
                     *
                     * _.toLength(Infinity);
                     * // => 4294967295
                     *
                     * _.toLength('3.2');
                     * // => 3
                     */
                    function toLength(value) {
                        return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
                    }

                    /**
                     * Converts `value` to a number.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to process.
                     * @returns {number} Returns the number.
                     * @example
                     *
                     * _.toNumber(3.2);
                     * // => 3.2
                     *
                     * _.toNumber(Number.MIN_VALUE);
                     * // => 5e-324
                     *
                     * _.toNumber(Infinity);
                     * // => Infinity
                     *
                     * _.toNumber('3.2');
                     * // => 3.2
                     */
                    function toNumber(value) {
                        if (typeof value == 'number') {
                            return value;
                        }
                        if (isSymbol(value)) {
                            return NAN;
                        }
                        if (isObject(value)) {
                            var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
                            value = isObject(other) ? (other + '') : other;
                        }
                        if (typeof value != 'string') {
                            return value === 0 ? value : +value;
                        }
                        value = value.replace(reTrim, '');
                        var isBinary = reIsBinary.test(value);
                        return (isBinary || reIsOctal.test(value))
                            ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
                            : (reIsBadHex.test(value) ? NAN : +value);
                    }

                    /**
                     * Converts `value` to a plain object flattening inherited enumerable string
                     * keyed properties of `value` to own properties of the plain object.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Lang
                     * @param {*} value The value to convert.
                     * @returns {Object} Returns the converted plain object.
                     * @example
                     *
                     * function Foo() {
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.assign({ 'a': 1 }, new Foo);
                     * // => { 'a': 1, 'b': 2 }
                     *
                     * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
                     * // => { 'a': 1, 'b': 2, 'c': 3 }
                     */
                    function toPlainObject(value) {
                        return copyObject(value, keysIn(value));
                    }

                    /**
                     * Converts `value` to a safe integer. A safe integer can be compared and
                     * represented correctly.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to convert.
                     * @returns {number} Returns the converted integer.
                     * @example
                     *
                     * _.toSafeInteger(3.2);
                     * // => 3
                     *
                     * _.toSafeInteger(Number.MIN_VALUE);
                     * // => 0
                     *
                     * _.toSafeInteger(Infinity);
                     * // => 9007199254740991
                     *
                     * _.toSafeInteger('3.2');
                     * // => 3
                     */
                    function toSafeInteger(value) {
                        return value
                            ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
                            : (value === 0 ? value : 0);
                    }

                    /**
                     * Converts `value` to a string. An empty string is returned for `null`
                     * and `undefined` values. The sign of `-0` is preserved.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Lang
                     * @param {*} value The value to convert.
                     * @returns {string} Returns the converted string.
                     * @example
                     *
                     * _.toString(null);
                     * // => ''
                     *
                     * _.toString(-0);
                     * // => '-0'
                     *
                     * _.toString([1, 2, 3]);
                     * // => '1,2,3'
                     */
                    function toString(value) {
                        return value == null ? '' : baseToString(value);
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Assigns own enumerable string keyed properties of source objects to the
                     * destination object. Source objects are applied from left to right.
                     * Subsequent sources overwrite property assignments of previous sources.
                     *
                     * **Note:** This method mutates `object` and is loosely based on
                     * [`Object.assign`](https://mdn.io/Object/assign).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.10.0
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} [sources] The source objects.
                     * @returns {Object} Returns `object`.
                     * @see _.assignIn
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     * }
                     *
                     * function Bar() {
     *   this.c = 3;
     * }
                     *
                     * Foo.prototype.b = 2;
                     * Bar.prototype.d = 4;
                     *
                     * _.assign({ 'a': 0 }, new Foo, new Bar);
                     * // => { 'a': 1, 'c': 3 }
                     */
                    var assign = createAssigner(function(object, source) {
                        if (isPrototype(source) || isArrayLike(source)) {
                            copyObject(source, keys(source), object);
                            return;
                        }
                        for (var key in source) {
                            if (hasOwnProperty.call(source, key)) {
                                assignValue(object, key, source[key]);
                            }
                        }
                    });

                    /**
                     * This method is like `_.assign` except that it iterates over own and
                     * inherited source properties.
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @alias extend
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} [sources] The source objects.
                     * @returns {Object} Returns `object`.
                     * @see _.assign
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     * }
                     *
                     * function Bar() {
     *   this.c = 3;
     * }
                     *
                     * Foo.prototype.b = 2;
                     * Bar.prototype.d = 4;
                     *
                     * _.assignIn({ 'a': 0 }, new Foo, new Bar);
                     * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
                     */
                    var assignIn = createAssigner(function(object, source) {
                        copyObject(source, keysIn(source), object);
                    });

                    /**
                     * This method is like `_.assignIn` except that it accepts `customizer`
                     * which is invoked to produce the assigned values. If `customizer` returns
                     * `undefined`, assignment is handled by the method instead. The `customizer`
                     * is invoked with five arguments: (objValue, srcValue, key, object, source).
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @alias extendWith
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} sources The source objects.
                     * @param {Function} [customizer] The function to customize assigned values.
                     * @returns {Object} Returns `object`.
                     * @see _.assignWith
                     * @example
                     *
                     * function customizer(objValue, srcValue) {
     *   return _.isUndefined(objValue) ? srcValue : objValue;
     * }
                     *
                     * var defaults = _.partialRight(_.assignInWith, customizer);
                     *
                     * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
                     * // => { 'a': 1, 'b': 2 }
                     */
                    var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
                        copyObject(source, keysIn(source), object, customizer);
                    });

                    /**
                     * This method is like `_.assign` except that it accepts `customizer`
                     * which is invoked to produce the assigned values. If `customizer` returns
                     * `undefined`, assignment is handled by the method instead. The `customizer`
                     * is invoked with five arguments: (objValue, srcValue, key, object, source).
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} sources The source objects.
                     * @param {Function} [customizer] The function to customize assigned values.
                     * @returns {Object} Returns `object`.
                     * @see _.assignInWith
                     * @example
                     *
                     * function customizer(objValue, srcValue) {
     *   return _.isUndefined(objValue) ? srcValue : objValue;
     * }
                     *
                     * var defaults = _.partialRight(_.assignWith, customizer);
                     *
                     * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
                     * // => { 'a': 1, 'b': 2 }
                     */
                    var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
                        copyObject(source, keys(source), object, customizer);
                    });

                    /**
                     * Creates an array of values corresponding to `paths` of `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.0.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {...(string|string[])} [paths] The property paths to pick.
                     * @returns {Array} Returns the picked values.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
                     *
                     * _.at(object, ['a[0].b.c', 'a[1]']);
                     * // => [3, 4]
                     */
                    var at = flatRest(baseAt);

                    /**
                     * Creates an object that inherits from the `prototype` object. If a
                     * `properties` object is given, its own enumerable string keyed properties
                     * are assigned to the created object.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.3.0
                     * @category Object
                     * @param {Object} prototype The object to inherit from.
                     * @param {Object} [properties] The properties to assign to the object.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * function Shape() {
     *   this.x = 0;
     *   this.y = 0;
     * }
                     *
                     * function Circle() {
     *   Shape.call(this);
     * }
                     *
                     * Circle.prototype = _.create(Shape.prototype, {
     *   'constructor': Circle
     * });
                     *
                     * var circle = new Circle;
                     * circle instanceof Circle;
                     * // => true
                     *
                     * circle instanceof Shape;
                     * // => true
                     */
                    function create(prototype, properties) {
                        var result = baseCreate(prototype);
                        return properties == null ? result : baseAssign(result, properties);
                    }

                    /**
                     * Assigns own and inherited enumerable string keyed properties of source
                     * objects to the destination object for all destination properties that
                     * resolve to `undefined`. Source objects are applied from left to right.
                     * Once a property is set, additional values of the same property are ignored.
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} [sources] The source objects.
                     * @returns {Object} Returns `object`.
                     * @see _.defaultsDeep
                     * @example
                     *
                     * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
                     * // => { 'a': 1, 'b': 2 }
                     */
                    var defaults = baseRest(function(args) {
                        args.push(undefined, customDefaultsAssignIn);
                        return apply(assignInWith, undefined, args);
                    });

                    /**
                     * This method is like `_.defaults` except that it recursively assigns
                     * default properties.
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.10.0
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} [sources] The source objects.
                     * @returns {Object} Returns `object`.
                     * @see _.defaults
                     * @example
                     *
                     * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
                     * // => { 'a': { 'b': 2, 'c': 3 } }
                     */
                    var defaultsDeep = baseRest(function(args) {
                        args.push(undefined, customDefaultsMerge);
                        return apply(mergeWith, undefined, args);
                    });

                    /**
                     * This method is like `_.find` except that it returns the key of the first
                     * element `predicate` returns truthy for instead of the element itself.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.1.0
                     * @category Object
                     * @param {Object} object The object to inspect.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {string|undefined} Returns the key of the matched element,
                     *  else `undefined`.
                     * @example
                     *
                     * var users = {
     *   'barney':  { 'age': 36, 'active': true },
     *   'fred':    { 'age': 40, 'active': false },
     *   'pebbles': { 'age': 1,  'active': true }
     * };
                     *
                     * _.findKey(users, function(o) { return o.age < 40; });
                     * // => 'barney' (iteration order is not guaranteed)
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.findKey(users, { 'age': 1, 'active': true });
                     * // => 'pebbles'
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.findKey(users, ['active', false]);
                     * // => 'fred'
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.findKey(users, 'active');
                     * // => 'barney'
                     */
                    function findKey(object, predicate) {
                        return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
                    }

                    /**
                     * This method is like `_.findKey` except that it iterates over elements of
                     * a collection in the opposite order.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Object
                     * @param {Object} object The object to inspect.
                     * @param {Function} [predicate=_.identity] The function invoked per iteration.
                     * @returns {string|undefined} Returns the key of the matched element,
                     *  else `undefined`.
                     * @example
                     *
                     * var users = {
     *   'barney':  { 'age': 36, 'active': true },
     *   'fred':    { 'age': 40, 'active': false },
     *   'pebbles': { 'age': 1,  'active': true }
     * };
                     *
                     * _.findLastKey(users, function(o) { return o.age < 40; });
                     * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.findLastKey(users, { 'age': 36, 'active': true });
                     * // => 'barney'
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.findLastKey(users, ['active', false]);
                     * // => 'fred'
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.findLastKey(users, 'active');
                     * // => 'pebbles'
                     */
                    function findLastKey(object, predicate) {
                        return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
                    }

                    /**
                     * Iterates over own and inherited enumerable string keyed properties of an
                     * object and invokes `iteratee` for each property. The iteratee is invoked
                     * with three arguments: (value, key, object). Iteratee functions may exit
                     * iteration early by explicitly returning `false`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.3.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Object} Returns `object`.
                     * @see _.forInRight
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.forIn(new Foo, function(value, key) {
     *   console.log(key);
     * });
                     * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
                     */
                    function forIn(object, iteratee) {
                        return object == null
                            ? object
                            : baseFor(object, getIteratee(iteratee, 3), keysIn);
                    }

                    /**
                     * This method is like `_.forIn` except that it iterates over properties of
                     * `object` in the opposite order.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Object} Returns `object`.
                     * @see _.forIn
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.forInRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
                     * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
                     */
                    function forInRight(object, iteratee) {
                        return object == null
                            ? object
                            : baseForRight(object, getIteratee(iteratee, 3), keysIn);
                    }

                    /**
                     * Iterates over own enumerable string keyed properties of an object and
                     * invokes `iteratee` for each property. The iteratee is invoked with three
                     * arguments: (value, key, object). Iteratee functions may exit iteration
                     * early by explicitly returning `false`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.3.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Object} Returns `object`.
                     * @see _.forOwnRight
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.forOwn(new Foo, function(value, key) {
     *   console.log(key);
     * });
                     * // => Logs 'a' then 'b' (iteration order is not guaranteed).
                     */
                    function forOwn(object, iteratee) {
                        return object && baseForOwn(object, getIteratee(iteratee, 3));
                    }

                    /**
                     * This method is like `_.forOwn` except that it iterates over properties of
                     * `object` in the opposite order.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.0.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Object} Returns `object`.
                     * @see _.forOwn
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.forOwnRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
                     * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
                     */
                    function forOwnRight(object, iteratee) {
                        return object && baseForOwnRight(object, getIteratee(iteratee, 3));
                    }

                    /**
                     * Creates an array of function property names from own enumerable properties
                     * of `object`.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The object to inspect.
                     * @returns {Array} Returns the function names.
                     * @see _.functionsIn
                     * @example
                     *
                     * function Foo() {
     *   this.a = _.constant('a');
     *   this.b = _.constant('b');
     * }
                     *
                     * Foo.prototype.c = _.constant('c');
                     *
                     * _.functions(new Foo);
                     * // => ['a', 'b']
                     */
                    function functions(object) {
                        return object == null ? [] : baseFunctions(object, keys(object));
                    }

                    /**
                     * Creates an array of function property names from own and inherited
                     * enumerable properties of `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The object to inspect.
                     * @returns {Array} Returns the function names.
                     * @see _.functions
                     * @example
                     *
                     * function Foo() {
     *   this.a = _.constant('a');
     *   this.b = _.constant('b');
     * }
                     *
                     * Foo.prototype.c = _.constant('c');
                     *
                     * _.functionsIn(new Foo);
                     * // => ['a', 'b', 'c']
                     */
                    function functionsIn(object) {
                        return object == null ? [] : baseFunctions(object, keysIn(object));
                    }

                    /**
                     * Gets the value at `path` of `object`. If the resolved value is
                     * `undefined`, the `defaultValue` is returned in its place.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.7.0
                     * @category Object
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path of the property to get.
                     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
                     * @returns {*} Returns the resolved value.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
                     *
                     * _.get(object, 'a[0].b.c');
                     * // => 3
                     *
                     * _.get(object, ['a', '0', 'b', 'c']);
                     * // => 3
                     *
                     * _.get(object, 'a.b.c', 'default');
                     * // => 'default'
                     */
                    function get(object, path, defaultValue) {
                        var result = object == null ? undefined : baseGet(object, path);
                        return result === undefined ? defaultValue : result;
                    }

                    /**
                     * Checks if `path` is a direct property of `object`.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path to check.
                     * @returns {boolean} Returns `true` if `path` exists, else `false`.
                     * @example
                     *
                     * var object = { 'a': { 'b': 2 } };
                     * var other = _.create({ 'a': _.create({ 'b': 2 }) });
                     *
                     * _.has(object, 'a');
                     * // => true
                     *
                     * _.has(object, 'a.b');
                     * // => true
                     *
                     * _.has(object, ['a', 'b']);
                     * // => true
                     *
                     * _.has(other, 'a');
                     * // => false
                     */
                    function has(object, path) {
                        return object != null && hasPath(object, path, baseHas);
                    }

                    /**
                     * Checks if `path` is a direct or inherited property of `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path to check.
                     * @returns {boolean} Returns `true` if `path` exists, else `false`.
                     * @example
                     *
                     * var object = _.create({ 'a': _.create({ 'b': 2 }) });
                     *
                     * _.hasIn(object, 'a');
                     * // => true
                     *
                     * _.hasIn(object, 'a.b');
                     * // => true
                     *
                     * _.hasIn(object, ['a', 'b']);
                     * // => true
                     *
                     * _.hasIn(object, 'b');
                     * // => false
                     */
                    function hasIn(object, path) {
                        return object != null && hasPath(object, path, baseHasIn);
                    }

                    /**
                     * Creates an object composed of the inverted keys and values of `object`.
                     * If `object` contains duplicate values, subsequent values overwrite
                     * property assignments of previous values.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.7.0
                     * @category Object
                     * @param {Object} object The object to invert.
                     * @returns {Object} Returns the new inverted object.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': 2, 'c': 1 };
                     *
                     * _.invert(object);
                     * // => { '1': 'c', '2': 'b' }
                     */
                    var invert = createInverter(function(result, value, key) {
                        result[value] = key;
                    }, constant(identity));

                    /**
                     * This method is like `_.invert` except that the inverted object is generated
                     * from the results of running each element of `object` thru `iteratee`. The
                     * corresponding inverted value of each inverted key is an array of keys
                     * responsible for generating the inverted value. The iteratee is invoked
                     * with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.1.0
                     * @category Object
                     * @param {Object} object The object to invert.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {Object} Returns the new inverted object.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': 2, 'c': 1 };
                     *
                     * _.invertBy(object);
                     * // => { '1': ['a', 'c'], '2': ['b'] }
                     *
                     * _.invertBy(object, function(value) {
     *   return 'group' + value;
     * });
                     * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
                     */
                    var invertBy = createInverter(function(result, value, key) {
                        if (hasOwnProperty.call(result, value)) {
                            result[value].push(key);
                        } else {
                            result[value] = [key];
                        }
                    }, getIteratee);

                    /**
                     * Invokes the method at `path` of `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path of the method to invoke.
                     * @param {...*} [args] The arguments to invoke the method with.
                     * @returns {*} Returns the result of the invoked method.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
                     *
                     * _.invoke(object, 'a[0].b.c.slice', 1, 3);
                     * // => [2, 3]
                     */
                    var invoke = baseRest(baseInvoke);

                    /**
                     * Creates an array of the own enumerable property names of `object`.
                     *
                     * **Note:** Non-object values are coerced to objects. See the
                     * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
                     * for more details.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property names.
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.keys(new Foo);
                     * // => ['a', 'b'] (iteration order is not guaranteed)
                     *
                     * _.keys('hi');
                     * // => ['0', '1']
                     */
                    function keys(object) {
                        return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
                    }

                    /**
                     * Creates an array of the own and inherited enumerable property names of `object`.
                     *
                     * **Note:** Non-object values are coerced to objects.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Object
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property names.
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.keysIn(new Foo);
                     * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
                     */
                    function keysIn(object) {
                        return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
                    }

                    /**
                     * The opposite of `_.mapValues`; this method creates an object with the
                     * same values as `object` and keys generated by running each own enumerable
                     * string keyed property of `object` thru `iteratee`. The iteratee is invoked
                     * with three arguments: (value, key, object).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.8.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Object} Returns the new mapped object.
                     * @see _.mapValues
                     * @example
                     *
                     * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
     *   return key + value;
     * });
                     * // => { 'a1': 1, 'b2': 2 }
                     */
                    function mapKeys(object, iteratee) {
                        var result = {};
                        iteratee = getIteratee(iteratee, 3);

                        baseForOwn(object, function(value, key, object) {
                            baseAssignValue(result, iteratee(value, key, object), value);
                        });
                        return result;
                    }

                    /**
                     * Creates an object with the same keys as `object` and values generated
                     * by running each own enumerable string keyed property of `object` thru
                     * `iteratee`. The iteratee is invoked with three arguments:
                     * (value, key, object).
                     *
                     * @static
                     * @memberOf _
                     * @since 2.4.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Object} Returns the new mapped object.
                     * @see _.mapKeys
                     * @example
                     *
                     * var users = {
     *   'fred':    { 'user': 'fred',    'age': 40 },
     *   'pebbles': { 'user': 'pebbles', 'age': 1 }
     * };
                     *
                     * _.mapValues(users, function(o) { return o.age; });
                     * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.mapValues(users, 'age');
                     * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
                     */
                    function mapValues(object, iteratee) {
                        var result = {};
                        iteratee = getIteratee(iteratee, 3);

                        baseForOwn(object, function(value, key, object) {
                            baseAssignValue(result, key, iteratee(value, key, object));
                        });
                        return result;
                    }

                    /**
                     * This method is like `_.assign` except that it recursively merges own and
                     * inherited enumerable string keyed properties of source objects into the
                     * destination object. Source properties that resolve to `undefined` are
                     * skipped if a destination value exists. Array and plain object properties
                     * are merged recursively. Other objects and value types are overridden by
                     * assignment. Source objects are applied from left to right. Subsequent
                     * sources overwrite property assignments of previous sources.
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.5.0
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} [sources] The source objects.
                     * @returns {Object} Returns `object`.
                     * @example
                     *
                     * var object = {
     *   'a': [{ 'b': 2 }, { 'd': 4 }]
     * };
                     *
                     * var other = {
     *   'a': [{ 'c': 3 }, { 'e': 5 }]
     * };
                     *
                     * _.merge(object, other);
                     * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
                     */
                    var merge = createAssigner(function(object, source, srcIndex) {
                        baseMerge(object, source, srcIndex);
                    });

                    /**
                     * This method is like `_.merge` except that it accepts `customizer` which
                     * is invoked to produce the merged values of the destination and source
                     * properties. If `customizer` returns `undefined`, merging is handled by the
                     * method instead. The `customizer` is invoked with six arguments:
                     * (objValue, srcValue, key, object, source, stack).
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The destination object.
                     * @param {...Object} sources The source objects.
                     * @param {Function} customizer The function to customize assigned values.
                     * @returns {Object} Returns `object`.
                     * @example
                     *
                     * function customizer(objValue, srcValue) {
     *   if (_.isArray(objValue)) {
     *     return objValue.concat(srcValue);
     *   }
     * }
                     *
                     * var object = { 'a': [1], 'b': [2] };
                     * var other = { 'a': [3], 'b': [4] };
                     *
                     * _.mergeWith(object, other, customizer);
                     * // => { 'a': [1, 3], 'b': [2, 4] }
                     */
                    var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
                        baseMerge(object, source, srcIndex, customizer);
                    });

                    /**
                     * The opposite of `_.pick`; this method creates an object composed of the
                     * own and inherited enumerable property paths of `object` that are not omitted.
                     *
                     * **Note:** This method is considerably slower than `_.pick`.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The source object.
                     * @param {...(string|string[])} [paths] The property paths to omit.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': '2', 'c': 3 };
                     *
                     * _.omit(object, ['a', 'c']);
                     * // => { 'b': '2' }
                     */
                    var omit = flatRest(function(object, paths) {
                        var result = {};
                        if (object == null) {
                            return result;
                        }
                        var isDeep = false;
                        paths = arrayMap(paths, function(path) {
                            path = castPath(path, object);
                            isDeep || (isDeep = path.length > 1);
                            return path;
                        });
                        copyObject(object, getAllKeysIn(object), result);
                        if (isDeep) {
                            result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
                        }
                        var length = paths.length;
                        while (length--) {
                            baseUnset(result, paths[length]);
                        }
                        return result;
                    });

                    /**
                     * The opposite of `_.pickBy`; this method creates an object composed of
                     * the own and inherited enumerable string keyed properties of `object` that
                     * `predicate` doesn't return truthy for. The predicate is invoked with two
                     * arguments: (value, key).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The source object.
                     * @param {Function} [predicate=_.identity] The function invoked per property.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': '2', 'c': 3 };
                     *
                     * _.omitBy(object, _.isNumber);
                     * // => { 'b': '2' }
                     */
                    function omitBy(object, predicate) {
                        return pickBy(object, negate(getIteratee(predicate)));
                    }

                    /**
                     * Creates an object composed of the picked `object` properties.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The source object.
                     * @param {...(string|string[])} [paths] The property paths to pick.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': '2', 'c': 3 };
                     *
                     * _.pick(object, ['a', 'c']);
                     * // => { 'a': 1, 'c': 3 }
                     */
                    var pick = flatRest(function(object, paths) {
                        return object == null ? {} : basePick(object, paths);
                    });

                    /**
                     * Creates an object composed of the `object` properties `predicate` returns
                     * truthy for. The predicate is invoked with two arguments: (value, key).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The source object.
                     * @param {Function} [predicate=_.identity] The function invoked per property.
                     * @returns {Object} Returns the new object.
                     * @example
                     *
                     * var object = { 'a': 1, 'b': '2', 'c': 3 };
                     *
                     * _.pickBy(object, _.isNumber);
                     * // => { 'a': 1, 'c': 3 }
                     */
                    function pickBy(object, predicate) {
                        if (object == null) {
                            return {};
                        }
                        var props = arrayMap(getAllKeysIn(object), function(prop) {
                            return [prop];
                        });
                        predicate = getIteratee(predicate);
                        return basePickBy(object, props, function(value, path) {
                            return predicate(value, path[0]);
                        });
                    }

                    /**
                     * This method is like `_.get` except that if the resolved value is a
                     * function it's invoked with the `this` binding of its parent object and
                     * its result is returned.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The object to query.
                     * @param {Array|string} path The path of the property to resolve.
                     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
                     * @returns {*} Returns the resolved value.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
                     *
                     * _.result(object, 'a[0].b.c1');
                     * // => 3
                     *
                     * _.result(object, 'a[0].b.c2');
                     * // => 4
                     *
                     * _.result(object, 'a[0].b.c3', 'default');
                     * // => 'default'
                     *
                     * _.result(object, 'a[0].b.c3', _.constant('default'));
                     * // => 'default'
                     */
                    function result(object, path, defaultValue) {
                        path = castPath(path, object);

                        var index = -1,
                            length = path.length;

                        // Ensure the loop is entered when path is empty.
                        if (!length) {
                            length = 1;
                            object = undefined;
                        }
                        while (++index < length) {
                            var value = object == null ? undefined : object[toKey(path[index])];
                            if (value === undefined) {
                                index = length;
                                value = defaultValue;
                            }
                            object = isFunction(value) ? value.call(object) : value;
                        }
                        return object;
                    }

                    /**
                     * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
                     * it's created. Arrays are created for missing index properties while objects
                     * are created for all other missing properties. Use `_.setWith` to customize
                     * `path` creation.
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.7.0
                     * @category Object
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The path of the property to set.
                     * @param {*} value The value to set.
                     * @returns {Object} Returns `object`.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
                     *
                     * _.set(object, 'a[0].b.c', 4);
                     * console.log(object.a[0].b.c);
                     * // => 4
                     *
                     * _.set(object, ['x', '0', 'y', 'z'], 5);
                     * console.log(object.x[0].y.z);
                     * // => 5
                     */
                    function set(object, path, value) {
                        return object == null ? object : baseSet(object, path, value);
                    }

                    /**
                     * This method is like `_.set` except that it accepts `customizer` which is
                     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
                     * path creation is handled by the method instead. The `customizer` is invoked
                     * with three arguments: (nsValue, key, nsObject).
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The path of the property to set.
                     * @param {*} value The value to set.
                     * @param {Function} [customizer] The function to customize assigned values.
                     * @returns {Object} Returns `object`.
                     * @example
                     *
                     * var object = {};
                     *
                     * _.setWith(object, '[0][1]', 'a', Object);
                     * // => { '0': { '1': 'a' } }
                     */
                    function setWith(object, path, value, customizer) {
                        customizer = typeof customizer == 'function' ? customizer : undefined;
                        return object == null ? object : baseSet(object, path, value, customizer);
                    }

                    /**
                     * Creates an array of own enumerable string keyed-value pairs for `object`
                     * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
                     * entries are returned.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @alias entries
                     * @category Object
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the key-value pairs.
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.toPairs(new Foo);
                     * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
                     */
                    var toPairs = createToPairs(keys);

                    /**
                     * Creates an array of own and inherited enumerable string keyed-value pairs
                     * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
                     * or set, its entries are returned.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @alias entriesIn
                     * @category Object
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the key-value pairs.
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.toPairsIn(new Foo);
                     * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
                     */
                    var toPairsIn = createToPairs(keysIn);

                    /**
                     * An alternative to `_.reduce`; this method transforms `object` to a new
                     * `accumulator` object which is the result of running each of its own
                     * enumerable string keyed properties thru `iteratee`, with each invocation
                     * potentially mutating the `accumulator` object. If `accumulator` is not
                     * provided, a new object with the same `[[Prototype]]` will be used. The
                     * iteratee is invoked with four arguments: (accumulator, value, key, object).
                     * Iteratee functions may exit iteration early by explicitly returning `false`.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.3.0
                     * @category Object
                     * @param {Object} object The object to iterate over.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @param {*} [accumulator] The custom accumulator value.
                     * @returns {*} Returns the accumulated value.
                     * @example
                     *
                     * _.transform([2, 3, 4], function(result, n) {
     *   result.push(n *= n);
     *   return n % 2 == 0;
     * }, []);
                     * // => [4, 9]
                     *
                     * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
     *   (result[value] || (result[value] = [])).push(key);
     * }, {});
                     * // => { '1': ['a', 'c'], '2': ['b'] }
                     */
                    function transform(object, iteratee, accumulator) {
                        var isArr = isArray(object),
                            isArrLike = isArr || isBuffer(object) || isTypedArray(object);

                        iteratee = getIteratee(iteratee, 4);
                        if (accumulator == null) {
                            var Ctor = object && object.constructor;
                            if (isArrLike) {
                                accumulator = isArr ? new Ctor : [];
                            }
                            else if (isObject(object)) {
                                accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
                            }
                            else {
                                accumulator = {};
                            }
                        }
                        (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
                            return iteratee(accumulator, value, index, object);
                        });
                        return accumulator;
                    }

                    /**
                     * Removes the property at `path` of `object`.
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Object
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The path of the property to unset.
                     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c': 7 } }] };
                     * _.unset(object, 'a[0].b.c');
                     * // => true
                     *
                     * console.log(object);
                     * // => { 'a': [{ 'b': {} }] };
                     *
                     * _.unset(object, ['a', '0', 'b', 'c']);
                     * // => true
                     *
                     * console.log(object);
                     * // => { 'a': [{ 'b': {} }] };
                     */
                    function unset(object, path) {
                        return object == null ? true : baseUnset(object, path);
                    }

                    /**
                     * This method is like `_.set` except that accepts `updater` to produce the
                     * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
                     * is invoked with one argument: (value).
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.6.0
                     * @category Object
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The path of the property to set.
                     * @param {Function} updater The function to produce the updated value.
                     * @returns {Object} Returns `object`.
                     * @example
                     *
                     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
                     *
                     * _.update(object, 'a[0].b.c', function(n) { return n * n; });
                     * console.log(object.a[0].b.c);
                     * // => 9
                     *
                     * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
                     * console.log(object.x[0].y.z);
                     * // => 0
                     */
                    function update(object, path, updater) {
                        return object == null ? object : baseUpdate(object, path, castFunction(updater));
                    }

                    /**
                     * This method is like `_.update` except that it accepts `customizer` which is
                     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
                     * path creation is handled by the method instead. The `customizer` is invoked
                     * with three arguments: (nsValue, key, nsObject).
                     *
                     * **Note:** This method mutates `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.6.0
                     * @category Object
                     * @param {Object} object The object to modify.
                     * @param {Array|string} path The path of the property to set.
                     * @param {Function} updater The function to produce the updated value.
                     * @param {Function} [customizer] The function to customize assigned values.
                     * @returns {Object} Returns `object`.
                     * @example
                     *
                     * var object = {};
                     *
                     * _.updateWith(object, '[0][1]', _.constant('a'), Object);
                     * // => { '0': { '1': 'a' } }
                     */
                    function updateWith(object, path, updater, customizer) {
                        customizer = typeof customizer == 'function' ? customizer : undefined;
                        return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
                    }

                    /**
                     * Creates an array of the own enumerable string keyed property values of `object`.
                     *
                     * **Note:** Non-object values are coerced to objects.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Object
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property values.
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.values(new Foo);
                     * // => [1, 2] (iteration order is not guaranteed)
                     *
                     * _.values('hi');
                     * // => ['h', 'i']
                     */
                    function values(object) {
                        return object == null ? [] : baseValues(object, keys(object));
                    }

                    /**
                     * Creates an array of the own and inherited enumerable string keyed property
                     * values of `object`.
                     *
                     * **Note:** Non-object values are coerced to objects.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Object
                     * @param {Object} object The object to query.
                     * @returns {Array} Returns the array of property values.
                     * @example
                     *
                     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
                     *
                     * Foo.prototype.c = 3;
                     *
                     * _.valuesIn(new Foo);
                     * // => [1, 2, 3] (iteration order is not guaranteed)
                     */
                    function valuesIn(object) {
                        return object == null ? [] : baseValues(object, keysIn(object));
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Clamps `number` within the inclusive `lower` and `upper` bounds.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Number
                     * @param {number} number The number to clamp.
                     * @param {number} [lower] The lower bound.
                     * @param {number} upper The upper bound.
                     * @returns {number} Returns the clamped number.
                     * @example
                     *
                     * _.clamp(-10, -5, 5);
                     * // => -5
                     *
                     * _.clamp(10, -5, 5);
                     * // => 5
                     */
                    function clamp(number, lower, upper) {
                        if (upper === undefined) {
                            upper = lower;
                            lower = undefined;
                        }
                        if (upper !== undefined) {
                            upper = toNumber(upper);
                            upper = upper === upper ? upper : 0;
                        }
                        if (lower !== undefined) {
                            lower = toNumber(lower);
                            lower = lower === lower ? lower : 0;
                        }
                        return baseClamp(toNumber(number), lower, upper);
                    }

                    /**
                     * Checks if `n` is between `start` and up to, but not including, `end`. If
                     * `end` is not specified, it's set to `start` with `start` then set to `0`.
                     * If `start` is greater than `end` the params are swapped to support
                     * negative ranges.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.3.0
                     * @category Number
                     * @param {number} number The number to check.
                     * @param {number} [start=0] The start of the range.
                     * @param {number} end The end of the range.
                     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
                     * @see _.range, _.rangeRight
                     * @example
                     *
                     * _.inRange(3, 2, 4);
                     * // => true
                     *
                     * _.inRange(4, 8);
                     * // => true
                     *
                     * _.inRange(4, 2);
                     * // => false
                     *
                     * _.inRange(2, 2);
                     * // => false
                     *
                     * _.inRange(1.2, 2);
                     * // => true
                     *
                     * _.inRange(5.2, 4);
                     * // => false
                     *
                     * _.inRange(-3, -2, -6);
                     * // => true
                     */
                    function inRange(number, start, end) {
                        start = toFinite(start);
                        if (end === undefined) {
                            end = start;
                            start = 0;
                        } else {
                            end = toFinite(end);
                        }
                        number = toNumber(number);
                        return baseInRange(number, start, end);
                    }

                    /**
                     * Produces a random number between the inclusive `lower` and `upper` bounds.
                     * If only one argument is provided a number between `0` and the given number
                     * is returned. If `floating` is `true`, or either `lower` or `upper` are
                     * floats, a floating-point number is returned instead of an integer.
                     *
                     * **Note:** JavaScript follows the IEEE-754 standard for resolving
                     * floating-point values which can produce unexpected results.
                     *
                     * @static
                     * @memberOf _
                     * @since 0.7.0
                     * @category Number
                     * @param {number} [lower=0] The lower bound.
                     * @param {number} [upper=1] The upper bound.
                     * @param {boolean} [floating] Specify returning a floating-point number.
                     * @returns {number} Returns the random number.
                     * @example
                     *
                     * _.random(0, 5);
                     * // => an integer between 0 and 5
                     *
                     * _.random(5);
                     * // => also an integer between 0 and 5
                     *
                     * _.random(5, true);
                     * // => a floating-point number between 0 and 5
                     *
                     * _.random(1.2, 5.2);
                     * // => a floating-point number between 1.2 and 5.2
                     */
                    function random(lower, upper, floating) {
                        if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
                            upper = floating = undefined;
                        }
                        if (floating === undefined) {
                            if (typeof upper == 'boolean') {
                                floating = upper;
                                upper = undefined;
                            }
                            else if (typeof lower == 'boolean') {
                                floating = lower;
                                lower = undefined;
                            }
                        }
                        if (lower === undefined && upper === undefined) {
                            lower = 0;
                            upper = 1;
                        }
                        else {
                            lower = toFinite(lower);
                            if (upper === undefined) {
                                upper = lower;
                                lower = 0;
                            } else {
                                upper = toFinite(upper);
                            }
                        }
                        if (lower > upper) {
                            var temp = lower;
                            lower = upper;
                            upper = temp;
                        }
                        if (floating || lower % 1 || upper % 1) {
                            var rand = nativeRandom();
                            return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
                        }
                        return baseRandom(lower, upper);
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the camel cased string.
                     * @example
                     *
                     * _.camelCase('Foo Bar');
                     * // => 'fooBar'
                     *
                     * _.camelCase('--foo-bar--');
                     * // => 'fooBar'
                     *
                     * _.camelCase('__FOO_BAR__');
                     * // => 'fooBar'
                     */
                    var camelCase = createCompounder(function(result, word, index) {
                        word = word.toLowerCase();
                        return result + (index ? capitalize(word) : word);
                    });

                    /**
                     * Converts the first character of `string` to upper case and the remaining
                     * to lower case.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to capitalize.
                     * @returns {string} Returns the capitalized string.
                     * @example
                     *
                     * _.capitalize('FRED');
                     * // => 'Fred'
                     */
                    function capitalize(string) {
                        return upperFirst(toString(string).toLowerCase());
                    }

                    /**
                     * Deburrs `string` by converting
                     * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
                     * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
                     * letters to basic Latin letters and removing
                     * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to deburr.
                     * @returns {string} Returns the deburred string.
                     * @example
                     *
                     * _.deburr('déjà vu');
                     * // => 'deja vu'
                     */
                    function deburr(string) {
                        string = toString(string);
                        return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
                    }

                    /**
                     * Checks if `string` ends with the given target string.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to inspect.
                     * @param {string} [target] The string to search for.
                     * @param {number} [position=string.length] The position to search up to.
                     * @returns {boolean} Returns `true` if `string` ends with `target`,
                     *  else `false`.
                     * @example
                     *
                     * _.endsWith('abc', 'c');
                     * // => true
                     *
                     * _.endsWith('abc', 'b');
                     * // => false
                     *
                     * _.endsWith('abc', 'b', 2);
                     * // => true
                     */
                    function endsWith(string, target, position) {
                        string = toString(string);
                        target = baseToString(target);

                        var length = string.length;
                        position = position === undefined
                            ? length
                            : baseClamp(toInteger(position), 0, length);

                        var end = position;
                        position -= target.length;
                        return position >= 0 && string.slice(position, end) == target;
                    }

                    /**
                     * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
                     * corresponding HTML entities.
                     *
                     * **Note:** No other characters are escaped. To escape additional
                     * characters use a third-party library like [_he_](https://mths.be/he).
                     *
                     * Though the ">" character is escaped for symmetry, characters like
                     * ">" and "/" don't need escaping in HTML and have no special meaning
                     * unless they're part of a tag or unquoted attribute value. See
                     * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
                     * (under "semi-related fun fact") for more details.
                     *
                     * When working with HTML you should always
                     * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
                     * XSS vectors.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category String
                     * @param {string} [string=''] The string to escape.
                     * @returns {string} Returns the escaped string.
                     * @example
                     *
                     * _.escape('fred, barney, & pebbles');
                     * // => 'fred, barney, &amp; pebbles'
                     */
                    function escape(string) {
                        string = toString(string);
                        return (string && reHasUnescapedHtml.test(string))
                            ? string.replace(reUnescapedHtml, escapeHtmlChar)
                            : string;
                    }

                    /**
                     * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
                     * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to escape.
                     * @returns {string} Returns the escaped string.
                     * @example
                     *
                     * _.escapeRegExp('[lodash](https://lodash.com/)');
                     * // => '\[lodash\]\(https://lodash\.com/\)'
                     */
                    function escapeRegExp(string) {
                        string = toString(string);
                        return (string && reHasRegExpChar.test(string))
                            ? string.replace(reRegExpChar, '\\$&')
                            : string;
                    }

                    /**
                     * Converts `string` to
                     * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the kebab cased string.
                     * @example
                     *
                     * _.kebabCase('Foo Bar');
                     * // => 'foo-bar'
                     *
                     * _.kebabCase('fooBar');
                     * // => 'foo-bar'
                     *
                     * _.kebabCase('__FOO_BAR__');
                     * // => 'foo-bar'
                     */
                    var kebabCase = createCompounder(function(result, word, index) {
                        return result + (index ? '-' : '') + word.toLowerCase();
                    });

                    /**
                     * Converts `string`, as space separated words, to lower case.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the lower cased string.
                     * @example
                     *
                     * _.lowerCase('--Foo-Bar--');
                     * // => 'foo bar'
                     *
                     * _.lowerCase('fooBar');
                     * // => 'foo bar'
                     *
                     * _.lowerCase('__FOO_BAR__');
                     * // => 'foo bar'
                     */
                    var lowerCase = createCompounder(function(result, word, index) {
                        return result + (index ? ' ' : '') + word.toLowerCase();
                    });

                    /**
                     * Converts the first character of `string` to lower case.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the converted string.
                     * @example
                     *
                     * _.lowerFirst('Fred');
                     * // => 'fred'
                     *
                     * _.lowerFirst('FRED');
                     * // => 'fRED'
                     */
                    var lowerFirst = createCaseFirst('toLowerCase');

                    /**
                     * Pads `string` on the left and right sides if it's shorter than `length`.
                     * Padding characters are truncated if they can't be evenly divided by `length`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to pad.
                     * @param {number} [length=0] The padding length.
                     * @param {string} [chars=' '] The string used as padding.
                     * @returns {string} Returns the padded string.
                     * @example
                     *
                     * _.pad('abc', 8);
                     * // => '  abc   '
                     *
                     * _.pad('abc', 8, '_-');
                     * // => '_-abc_-_'
                     *
                     * _.pad('abc', 3);
                     * // => 'abc'
                     */
                    function pad(string, length, chars) {
                        string = toString(string);
                        length = toInteger(length);

                        var strLength = length ? stringSize(string) : 0;
                        if (!length || strLength >= length) {
                            return string;
                        }
                        var mid = (length - strLength) / 2;
                        return (
                            createPadding(nativeFloor(mid), chars) +
                            string +
                            createPadding(nativeCeil(mid), chars)
                        );
                    }

                    /**
                     * Pads `string` on the right side if it's shorter than `length`. Padding
                     * characters are truncated if they exceed `length`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to pad.
                     * @param {number} [length=0] The padding length.
                     * @param {string} [chars=' '] The string used as padding.
                     * @returns {string} Returns the padded string.
                     * @example
                     *
                     * _.padEnd('abc', 6);
                     * // => 'abc   '
                     *
                     * _.padEnd('abc', 6, '_-');
                     * // => 'abc_-_'
                     *
                     * _.padEnd('abc', 3);
                     * // => 'abc'
                     */
                    function padEnd(string, length, chars) {
                        string = toString(string);
                        length = toInteger(length);

                        var strLength = length ? stringSize(string) : 0;
                        return (length && strLength < length)
                            ? (string + createPadding(length - strLength, chars))
                            : string;
                    }

                    /**
                     * Pads `string` on the left side if it's shorter than `length`. Padding
                     * characters are truncated if they exceed `length`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to pad.
                     * @param {number} [length=0] The padding length.
                     * @param {string} [chars=' '] The string used as padding.
                     * @returns {string} Returns the padded string.
                     * @example
                     *
                     * _.padStart('abc', 6);
                     * // => '   abc'
                     *
                     * _.padStart('abc', 6, '_-');
                     * // => '_-_abc'
                     *
                     * _.padStart('abc', 3);
                     * // => 'abc'
                     */
                    function padStart(string, length, chars) {
                        string = toString(string);
                        length = toInteger(length);

                        var strLength = length ? stringSize(string) : 0;
                        return (length && strLength < length)
                            ? (createPadding(length - strLength, chars) + string)
                            : string;
                    }

                    /**
                     * Converts `string` to an integer of the specified radix. If `radix` is
                     * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
                     * hexadecimal, in which case a `radix` of `16` is used.
                     *
                     * **Note:** This method aligns with the
                     * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
                     *
                     * @static
                     * @memberOf _
                     * @since 1.1.0
                     * @category String
                     * @param {string} string The string to convert.
                     * @param {number} [radix=10] The radix to interpret `value` by.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {number} Returns the converted integer.
                     * @example
                     *
                     * _.parseInt('08');
                     * // => 8
                     *
                     * _.map(['6', '08', '10'], _.parseInt);
                     * // => [6, 8, 10]
                     */
                    function parseInt(string, radix, guard) {
                        if (guard || radix == null) {
                            radix = 0;
                        } else if (radix) {
                            radix = +radix;
                        }
                        return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
                    }

                    /**
                     * Repeats the given string `n` times.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to repeat.
                     * @param {number} [n=1] The number of times to repeat the string.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {string} Returns the repeated string.
                     * @example
                     *
                     * _.repeat('*', 3);
                     * // => '***'
                     *
                     * _.repeat('abc', 2);
                     * // => 'abcabc'
                     *
                     * _.repeat('abc', 0);
                     * // => ''
                     */
                    function repeat(string, n, guard) {
                        if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
                            n = 1;
                        } else {
                            n = toInteger(n);
                        }
                        return baseRepeat(toString(string), n);
                    }

                    /**
                     * Replaces matches for `pattern` in `string` with `replacement`.
                     *
                     * **Note:** This method is based on
                     * [`String#replace`](https://mdn.io/String/replace).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to modify.
                     * @param {RegExp|string} pattern The pattern to replace.
                     * @param {Function|string} replacement The match replacement.
                     * @returns {string} Returns the modified string.
                     * @example
                     *
                     * _.replace('Hi Fred', 'Fred', 'Barney');
                     * // => 'Hi Barney'
                     */
                    function replace() {
                        var args = arguments,
                            string = toString(args[0]);

                        return args.length < 3 ? string : string.replace(args[1], args[2]);
                    }

                    /**
                     * Converts `string` to
                     * [snake case](https://en.wikipedia.org/wiki/Snake_case).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the snake cased string.
                     * @example
                     *
                     * _.snakeCase('Foo Bar');
                     * // => 'foo_bar'
                     *
                     * _.snakeCase('fooBar');
                     * // => 'foo_bar'
                     *
                     * _.snakeCase('--FOO-BAR--');
                     * // => 'foo_bar'
                     */
                    var snakeCase = createCompounder(function(result, word, index) {
                        return result + (index ? '_' : '') + word.toLowerCase();
                    });

                    /**
                     * Splits `string` by `separator`.
                     *
                     * **Note:** This method is based on
                     * [`String#split`](https://mdn.io/String/split).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to split.
                     * @param {RegExp|string} separator The separator pattern to split by.
                     * @param {number} [limit] The length to truncate results to.
                     * @returns {Array} Returns the string segments.
                     * @example
                     *
                     * _.split('a-b-c', '-', 2);
                     * // => ['a', 'b']
                     */
                    function split(string, separator, limit) {
                        if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
                            separator = limit = undefined;
                        }
                        limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
                        if (!limit) {
                            return [];
                        }
                        string = toString(string);
                        if (string && (
                                typeof separator == 'string' ||
                                (separator != null && !isRegExp(separator))
                            )) {
                            separator = baseToString(separator);
                            if (!separator && hasUnicode(string)) {
                                return castSlice(stringToArray(string), 0, limit);
                            }
                        }
                        return string.split(separator, limit);
                    }

                    /**
                     * Converts `string` to
                     * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
                     *
                     * @static
                     * @memberOf _
                     * @since 3.1.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the start cased string.
                     * @example
                     *
                     * _.startCase('--foo-bar--');
                     * // => 'Foo Bar'
                     *
                     * _.startCase('fooBar');
                     * // => 'Foo Bar'
                     *
                     * _.startCase('__FOO_BAR__');
                     * // => 'FOO BAR'
                     */
                    var startCase = createCompounder(function(result, word, index) {
                        return result + (index ? ' ' : '') + upperFirst(word);
                    });

                    /**
                     * Checks if `string` starts with the given target string.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to inspect.
                     * @param {string} [target] The string to search for.
                     * @param {number} [position=0] The position to search from.
                     * @returns {boolean} Returns `true` if `string` starts with `target`,
                     *  else `false`.
                     * @example
                     *
                     * _.startsWith('abc', 'a');
                     * // => true
                     *
                     * _.startsWith('abc', 'b');
                     * // => false
                     *
                     * _.startsWith('abc', 'b', 1);
                     * // => true
                     */
                    function startsWith(string, target, position) {
                        string = toString(string);
                        position = position == null
                            ? 0
                            : baseClamp(toInteger(position), 0, string.length);

                        target = baseToString(target);
                        return string.slice(position, position + target.length) == target;
                    }

                    /**
                     * Creates a compiled template function that can interpolate data properties
                     * in "interpolate" delimiters, HTML-escape interpolated data properties in
                     * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
                     * properties may be accessed as free variables in the template. If a setting
                     * object is given, it takes precedence over `_.templateSettings` values.
                     *
                     * **Note:** In the development build `_.template` utilizes
                     * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
                     * for easier debugging.
                     *
                     * For more information on precompiling templates see
                     * [lodash's custom builds documentation](https://lodash.com/custom-builds).
                     *
                     * For more information on Chrome extension sandboxes see
                     * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category String
                     * @param {string} [string=''] The template string.
                     * @param {Object} [options={}] The options object.
                     * @param {RegExp} [options.escape=_.templateSettings.escape]
                     *  The HTML "escape" delimiter.
                     * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
                     *  The "evaluate" delimiter.
                     * @param {Object} [options.imports=_.templateSettings.imports]
                     *  An object to import into the template as free variables.
                     * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
                     *  The "interpolate" delimiter.
                     * @param {string} [options.sourceURL='lodash.templateSources[n]']
                     *  The sourceURL of the compiled template.
                     * @param {string} [options.variable='obj']
                     *  The data object variable name.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Function} Returns the compiled template function.
                     * @example
                     *
                     * // Use the "interpolate" delimiter to create a compiled template.
                     * var compiled = _.template('hello <%= user %>!');
                     * compiled({ 'user': 'fred' });
                     * // => 'hello fred!'
                     *
                     * // Use the HTML "escape" delimiter to escape data property values.
                     * var compiled = _.template('<b><%- value %></b>');
                     * compiled({ 'value': '<script>' });
                     * // => '<b>&lt;script&gt;</b>'
                     *
                     * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
                     * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
                     * compiled({ 'users': ['fred', 'barney'] });
                     * // => '<li>fred</li><li>barney</li>'
                     *
                     * // Use the internal `print` function in "evaluate" delimiters.
                     * var compiled = _.template('<% print("hello " + user); %>!');
                     * compiled({ 'user': 'barney' });
                     * // => 'hello barney!'
                     *
                     * // Use the ES template literal delimiter as an "interpolate" delimiter.
                     * // Disable support by replacing the "interpolate" delimiter.
                     * var compiled = _.template('hello ${ user }!');
                     * compiled({ 'user': 'pebbles' });
                     * // => 'hello pebbles!'
                     *
                     * // Use backslashes to treat delimiters as plain text.
                     * var compiled = _.template('<%= "\\<%- value %\\>" %>');
                     * compiled({ 'value': 'ignored' });
                     * // => '<%- value %>'
                     *
                     * // Use the `imports` option to import `jQuery` as `jq`.
                     * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
                     * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
                     * compiled({ 'users': ['fred', 'barney'] });
                     * // => '<li>fred</li><li>barney</li>'
                     *
                     * // Use the `sourceURL` option to specify a custom sourceURL for the template.
                     * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
                     * compiled(data);
                     * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
                     *
                     * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
                     * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
                     * compiled.source;
                     * // => function(data) {
     * //   var __t, __p = '';
     * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
     * //   return __p;
     * // }
                     *
                     * // Use custom template delimiters.
                     * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
                     * var compiled = _.template('hello {{ user }}!');
                     * compiled({ 'user': 'mustache' });
                     * // => 'hello mustache!'
                     *
                     * // Use the `source` property to inline compiled templates for meaningful
                     * // line numbers in error messages and stack traces.
                     * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
                     *   var JST = {\
     *     "main": ' + _.template(mainText).source + '\
     *   };\
                     * ');
                     */
                    function template(string, options, guard) {
                        // Based on John Resig's `tmpl` implementation
                        // (http://ejohn.org/blog/javascript-micro-templating/)
                        // and Laura Doktorova's doT.js (https://github.com/olado/doT).
                        var settings = lodash.templateSettings;

                        if (guard && isIterateeCall(string, options, guard)) {
                            options = undefined;
                        }
                        string = toString(string);
                        options = assignInWith({}, options, settings, customDefaultsAssignIn);

                        var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
                            importsKeys = keys(imports),
                            importsValues = baseValues(imports, importsKeys);

                        var isEscaping,
                            isEvaluating,
                            index = 0,
                            interpolate = options.interpolate || reNoMatch,
                            source = "__p += '";

                        // Compile the regexp to match each delimiter.
                        var reDelimiters = RegExp(
                            (options.escape || reNoMatch).source + '|' +
                            interpolate.source + '|' +
                            (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
                            (options.evaluate || reNoMatch).source + '|$'
                            , 'g');

                        // Use a sourceURL for easier debugging.
                        var sourceURL = '//# sourceURL=' +
                            ('sourceURL' in options
                                    ? options.sourceURL
                                    : ('lodash.templateSources[' + (++templateCounter) + ']')
                            ) + '\n';

                        string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
                            interpolateValue || (interpolateValue = esTemplateValue);

                            // Escape characters that can't be included in string literals.
                            source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);

                            // Replace delimiters with snippets.
                            if (escapeValue) {
                                isEscaping = true;
                                source += "' +\n__e(" + escapeValue + ") +\n'";
                            }
                            if (evaluateValue) {
                                isEvaluating = true;
                                source += "';\n" + evaluateValue + ";\n__p += '";
                            }
                            if (interpolateValue) {
                                source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
                            }
                            index = offset + match.length;

                            // The JS engine embedded in Adobe products needs `match` returned in
                            // order to produce the correct `offset` value.
                            return match;
                        });

                        source += "';\n";

                        // If `variable` is not specified wrap a with-statement around the generated
                        // code to add the data object to the top of the scope chain.
                        var variable = options.variable;
                        if (!variable) {
                            source = 'with (obj) {\n' + source + '\n}\n';
                        }
                        // Cleanup code by stripping empty strings.
                        source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
                            .replace(reEmptyStringMiddle, '$1')
                            .replace(reEmptyStringTrailing, '$1;');

                        // Frame code as the function body.
                        source = 'function(' + (variable || 'obj') + ') {\n' +
                            (variable
                                    ? ''
                                    : 'obj || (obj = {});\n'
                            ) +
                            "var __t, __p = ''" +
                            (isEscaping
                                    ? ', __e = _.escape'
                                    : ''
                            ) +
                            (isEvaluating
                                    ? ', __j = Array.prototype.join;\n' +
                                    "function print() { __p += __j.call(arguments, '') }\n"
                                    : ';\n'
                            ) +
                            source +
                            'return __p\n}';

                        var result = attempt(function() {
                            return Function(importsKeys, sourceURL + 'return ' + source)
                                .apply(undefined, importsValues);
                        });

                        // Provide the compiled function's source by its `toString` method or
                        // the `source` property as a convenience for inlining compiled templates.
                        result.source = source;
                        if (isError(result)) {
                            throw result;
                        }
                        return result;
                    }

                    /**
                     * Converts `string`, as a whole, to lower case just like
                     * [String#toLowerCase](https://mdn.io/toLowerCase).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the lower cased string.
                     * @example
                     *
                     * _.toLower('--Foo-Bar--');
                     * // => '--foo-bar--'
                     *
                     * _.toLower('fooBar');
                     * // => 'foobar'
                     *
                     * _.toLower('__FOO_BAR__');
                     * // => '__foo_bar__'
                     */
                    function toLower(value) {
                        return toString(value).toLowerCase();
                    }

                    /**
                     * Converts `string`, as a whole, to upper case just like
                     * [String#toUpperCase](https://mdn.io/toUpperCase).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the upper cased string.
                     * @example
                     *
                     * _.toUpper('--foo-bar--');
                     * // => '--FOO-BAR--'
                     *
                     * _.toUpper('fooBar');
                     * // => 'FOOBAR'
                     *
                     * _.toUpper('__foo_bar__');
                     * // => '__FOO_BAR__'
                     */
                    function toUpper(value) {
                        return toString(value).toUpperCase();
                    }

                    /**
                     * Removes leading and trailing whitespace or specified characters from `string`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to trim.
                     * @param {string} [chars=whitespace] The characters to trim.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {string} Returns the trimmed string.
                     * @example
                     *
                     * _.trim('  abc  ');
                     * // => 'abc'
                     *
                     * _.trim('-_-abc-_-', '_-');
                     * // => 'abc'
                     *
                     * _.map(['  foo  ', '  bar  '], _.trim);
                     * // => ['foo', 'bar']
                     */
                    function trim(string, chars, guard) {
                        string = toString(string);
                        if (string && (guard || chars === undefined)) {
                            return string.replace(reTrim, '');
                        }
                        if (!string || !(chars = baseToString(chars))) {
                            return string;
                        }
                        var strSymbols = stringToArray(string),
                            chrSymbols = stringToArray(chars),
                            start = charsStartIndex(strSymbols, chrSymbols),
                            end = charsEndIndex(strSymbols, chrSymbols) + 1;

                        return castSlice(strSymbols, start, end).join('');
                    }

                    /**
                     * Removes trailing whitespace or specified characters from `string`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to trim.
                     * @param {string} [chars=whitespace] The characters to trim.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {string} Returns the trimmed string.
                     * @example
                     *
                     * _.trimEnd('  abc  ');
                     * // => '  abc'
                     *
                     * _.trimEnd('-_-abc-_-', '_-');
                     * // => '-_-abc'
                     */
                    function trimEnd(string, chars, guard) {
                        string = toString(string);
                        if (string && (guard || chars === undefined)) {
                            return string.replace(reTrimEnd, '');
                        }
                        if (!string || !(chars = baseToString(chars))) {
                            return string;
                        }
                        var strSymbols = stringToArray(string),
                            end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;

                        return castSlice(strSymbols, 0, end).join('');
                    }

                    /**
                     * Removes leading whitespace or specified characters from `string`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to trim.
                     * @param {string} [chars=whitespace] The characters to trim.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {string} Returns the trimmed string.
                     * @example
                     *
                     * _.trimStart('  abc  ');
                     * // => 'abc  '
                     *
                     * _.trimStart('-_-abc-_-', '_-');
                     * // => 'abc-_-'
                     */
                    function trimStart(string, chars, guard) {
                        string = toString(string);
                        if (string && (guard || chars === undefined)) {
                            return string.replace(reTrimStart, '');
                        }
                        if (!string || !(chars = baseToString(chars))) {
                            return string;
                        }
                        var strSymbols = stringToArray(string),
                            start = charsStartIndex(strSymbols, stringToArray(chars));

                        return castSlice(strSymbols, start).join('');
                    }

                    /**
                     * Truncates `string` if it's longer than the given maximum string length.
                     * The last characters of the truncated string are replaced with the omission
                     * string which defaults to "...".
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to truncate.
                     * @param {Object} [options={}] The options object.
                     * @param {number} [options.length=30] The maximum string length.
                     * @param {string} [options.omission='...'] The string to indicate text is omitted.
                     * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
                     * @returns {string} Returns the truncated string.
                     * @example
                     *
                     * _.truncate('hi-diddly-ho there, neighborino');
                     * // => 'hi-diddly-ho there, neighbo...'
                     *
                     * _.truncate('hi-diddly-ho there, neighborino', {
     *   'length': 24,
     *   'separator': ' '
     * });
                     * // => 'hi-diddly-ho there,...'
                     *
                     * _.truncate('hi-diddly-ho there, neighborino', {
     *   'length': 24,
     *   'separator': /,? +/
     * });
                     * // => 'hi-diddly-ho there...'
                     *
                     * _.truncate('hi-diddly-ho there, neighborino', {
     *   'omission': ' [...]'
     * });
                     * // => 'hi-diddly-ho there, neig [...]'
                     */
                    function truncate(string, options) {
                        var length = DEFAULT_TRUNC_LENGTH,
                            omission = DEFAULT_TRUNC_OMISSION;

                        if (isObject(options)) {
                            var separator = 'separator' in options ? options.separator : separator;
                            length = 'length' in options ? toInteger(options.length) : length;
                            omission = 'omission' in options ? baseToString(options.omission) : omission;
                        }
                        string = toString(string);

                        var strLength = string.length;
                        if (hasUnicode(string)) {
                            var strSymbols = stringToArray(string);
                            strLength = strSymbols.length;
                        }
                        if (length >= strLength) {
                            return string;
                        }
                        var end = length - stringSize(omission);
                        if (end < 1) {
                            return omission;
                        }
                        var result = strSymbols
                            ? castSlice(strSymbols, 0, end).join('')
                            : string.slice(0, end);

                        if (separator === undefined) {
                            return result + omission;
                        }
                        if (strSymbols) {
                            end += (result.length - end);
                        }
                        if (isRegExp(separator)) {
                            if (string.slice(end).search(separator)) {
                                var match,
                                    substring = result;

                                if (!separator.global) {
                                    separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
                                }
                                separator.lastIndex = 0;
                                while ((match = separator.exec(substring))) {
                                    var newEnd = match.index;
                                }
                                result = result.slice(0, newEnd === undefined ? end : newEnd);
                            }
                        } else if (string.indexOf(baseToString(separator), end) != end) {
                            var index = result.lastIndexOf(separator);
                            if (index > -1) {
                                result = result.slice(0, index);
                            }
                        }
                        return result + omission;
                    }

                    /**
                     * The inverse of `_.escape`; this method converts the HTML entities
                     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
                     * their corresponding characters.
                     *
                     * **Note:** No other HTML entities are unescaped. To unescape additional
                     * HTML entities use a third-party library like [_he_](https://mths.be/he).
                     *
                     * @static
                     * @memberOf _
                     * @since 0.6.0
                     * @category String
                     * @param {string} [string=''] The string to unescape.
                     * @returns {string} Returns the unescaped string.
                     * @example
                     *
                     * _.unescape('fred, barney, &amp; pebbles');
                     * // => 'fred, barney, & pebbles'
                     */
                    function unescape(string) {
                        string = toString(string);
                        return (string && reHasEscapedHtml.test(string))
                            ? string.replace(reEscapedHtml, unescapeHtmlChar)
                            : string;
                    }

                    /**
                     * Converts `string`, as space separated words, to upper case.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the upper cased string.
                     * @example
                     *
                     * _.upperCase('--foo-bar');
                     * // => 'FOO BAR'
                     *
                     * _.upperCase('fooBar');
                     * // => 'FOO BAR'
                     *
                     * _.upperCase('__foo_bar__');
                     * // => 'FOO BAR'
                     */
                    var upperCase = createCompounder(function(result, word, index) {
                        return result + (index ? ' ' : '') + word.toUpperCase();
                    });

                    /**
                     * Converts the first character of `string` to upper case.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category String
                     * @param {string} [string=''] The string to convert.
                     * @returns {string} Returns the converted string.
                     * @example
                     *
                     * _.upperFirst('fred');
                     * // => 'Fred'
                     *
                     * _.upperFirst('FRED');
                     * // => 'FRED'
                     */
                    var upperFirst = createCaseFirst('toUpperCase');

                    /**
                     * Splits `string` into an array of its words.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category String
                     * @param {string} [string=''] The string to inspect.
                     * @param {RegExp|string} [pattern] The pattern to match words.
                     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
                     * @returns {Array} Returns the words of `string`.
                     * @example
                     *
                     * _.words('fred, barney, & pebbles');
                     * // => ['fred', 'barney', 'pebbles']
                     *
                     * _.words('fred, barney, & pebbles', /[^, ]+/g);
                     * // => ['fred', 'barney', '&', 'pebbles']
                     */
                    function words(string, pattern, guard) {
                        string = toString(string);
                        pattern = guard ? undefined : pattern;

                        if (pattern === undefined) {
                            return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
                        }
                        return string.match(pattern) || [];
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Attempts to invoke `func`, returning either the result or the caught error
                     * object. Any additional arguments are provided to `func` when it's invoked.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Util
                     * @param {Function} func The function to attempt.
                     * @param {...*} [args] The arguments to invoke `func` with.
                     * @returns {*} Returns the `func` result or error object.
                     * @example
                     *
                     * // Avoid throwing errors for invalid selectors.
                     * var elements = _.attempt(function(selector) {
     *   return document.querySelectorAll(selector);
     * }, '>_>');
                     *
                     * if (_.isError(elements)) {
     *   elements = [];
     * }
                     */
                    var attempt = baseRest(function(func, args) {
                        try {
                            return apply(func, undefined, args);
                        } catch (e) {
                            return isError(e) ? e : new Error(e);
                        }
                    });

                    /**
                     * Binds methods of an object to the object itself, overwriting the existing
                     * method.
                     *
                     * **Note:** This method doesn't set the "length" property of bound functions.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Util
                     * @param {Object} object The object to bind and assign the bound methods to.
                     * @param {...(string|string[])} methodNames The object method names to bind.
                     * @returns {Object} Returns `object`.
                     * @example
                     *
                     * var view = {
     *   'label': 'docs',
     *   'click': function() {
     *     console.log('clicked ' + this.label);
     *   }
     * };
                     *
                     * _.bindAll(view, ['click']);
                     * jQuery(element).on('click', view.click);
                     * // => Logs 'clicked docs' when clicked.
                     */
                    var bindAll = flatRest(function(object, methodNames) {
                        arrayEach(methodNames, function(key) {
                            key = toKey(key);
                            baseAssignValue(object, key, bind(object[key], object));
                        });
                        return object;
                    });

                    /**
                     * Creates a function that iterates over `pairs` and invokes the corresponding
                     * function of the first predicate to return truthy. The predicate-function
                     * pairs are invoked with the `this` binding and arguments of the created
                     * function.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {Array} pairs The predicate-function pairs.
                     * @returns {Function} Returns the new composite function.
                     * @example
                     *
                     * var func = _.cond([
                     *   [_.matches({ 'a': 1 }),           _.constant('matches A')],
                     *   [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
                     *   [_.stubTrue,                      _.constant('no match')]
                     * ]);
                     *
                     * func({ 'a': 1, 'b': 2 });
                     * // => 'matches A'
                     *
                     * func({ 'a': 0, 'b': 1 });
                     * // => 'matches B'
                     *
                     * func({ 'a': '1', 'b': '2' });
                     * // => 'no match'
                     */
                    function cond(pairs) {
                        var length = pairs == null ? 0 : pairs.length,
                            toIteratee = getIteratee();

                        pairs = !length ? [] : arrayMap(pairs, function(pair) {
                            if (typeof pair[1] != 'function') {
                                throw new TypeError(FUNC_ERROR_TEXT);
                            }
                            return [toIteratee(pair[0]), pair[1]];
                        });

                        return baseRest(function(args) {
                            var index = -1;
                            while (++index < length) {
                                var pair = pairs[index];
                                if (apply(pair[0], this, args)) {
                                    return apply(pair[1], this, args);
                                }
                            }
                        });
                    }

                    /**
                     * Creates a function that invokes the predicate properties of `source` with
                     * the corresponding property values of a given object, returning `true` if
                     * all predicates return truthy, else `false`.
                     *
                     * **Note:** The created function is equivalent to `_.conformsTo` with
                     * `source` partially applied.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {Object} source The object of property predicates to conform to.
                     * @returns {Function} Returns the new spec function.
                     * @example
                     *
                     * var objects = [
                     *   { 'a': 2, 'b': 1 },
                     *   { 'a': 1, 'b': 2 }
                     * ];
                     *
                     * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
                     * // => [{ 'a': 1, 'b': 2 }]
                     */
                    function conforms(source) {
                        return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
                    }

                    /**
                     * Creates a function that returns `value`.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.4.0
                     * @category Util
                     * @param {*} value The value to return from the new function.
                     * @returns {Function} Returns the new constant function.
                     * @example
                     *
                     * var objects = _.times(2, _.constant({ 'a': 1 }));
                     *
                     * console.log(objects);
                     * // => [{ 'a': 1 }, { 'a': 1 }]
                     *
                     * console.log(objects[0] === objects[1]);
                     * // => true
                     */
                    function constant(value) {
                        return function() {
                            return value;
                        };
                    }

                    /**
                     * Checks `value` to determine whether a default value should be returned in
                     * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
                     * or `undefined`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.14.0
                     * @category Util
                     * @param {*} value The value to check.
                     * @param {*} defaultValue The default value.
                     * @returns {*} Returns the resolved value.
                     * @example
                     *
                     * _.defaultTo(1, 10);
                     * // => 1
                     *
                     * _.defaultTo(undefined, 10);
                     * // => 10
                     */
                    function defaultTo(value, defaultValue) {
                        return (value == null || value !== value) ? defaultValue : value;
                    }

                    /**
                     * Creates a function that returns the result of invoking the given functions
                     * with the `this` binding of the created function, where each successive
                     * invocation is supplied the return value of the previous.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Util
                     * @param {...(Function|Function[])} [funcs] The functions to invoke.
                     * @returns {Function} Returns the new composite function.
                     * @see _.flowRight
                     * @example
                     *
                     * function square(n) {
     *   return n * n;
     * }
                     *
                     * var addSquare = _.flow([_.add, square]);
                     * addSquare(1, 2);
                     * // => 9
                     */
                    var flow = createFlow();

                    /**
                     * This method is like `_.flow` except that it creates a function that
                     * invokes the given functions from right to left.
                     *
                     * @static
                     * @since 3.0.0
                     * @memberOf _
                     * @category Util
                     * @param {...(Function|Function[])} [funcs] The functions to invoke.
                     * @returns {Function} Returns the new composite function.
                     * @see _.flow
                     * @example
                     *
                     * function square(n) {
     *   return n * n;
     * }
                     *
                     * var addSquare = _.flowRight([square, _.add]);
                     * addSquare(1, 2);
                     * // => 9
                     */
                    var flowRight = createFlow(true);

                    /**
                     * This method returns the first argument it receives.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Util
                     * @param {*} value Any value.
                     * @returns {*} Returns `value`.
                     * @example
                     *
                     * var object = { 'a': 1 };
                     *
                     * console.log(_.identity(object) === object);
                     * // => true
                     */
                    function identity(value) {
                        return value;
                    }

                    /**
                     * Creates a function that invokes `func` with the arguments of the created
                     * function. If `func` is a property name, the created function returns the
                     * property value for a given element. If `func` is an array or object, the
                     * created function returns `true` for elements that contain the equivalent
                     * source properties, otherwise it returns `false`.
                     *
                     * @static
                     * @since 4.0.0
                     * @memberOf _
                     * @category Util
                     * @param {*} [func=_.identity] The value to convert to a callback.
                     * @returns {Function} Returns the callback.
                     * @example
                     *
                     * var users = [
                     *   { 'user': 'barney', 'age': 36, 'active': true },
                     *   { 'user': 'fred',   'age': 40, 'active': false }
                     * ];
                     *
                     * // The `_.matches` iteratee shorthand.
                     * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
                     * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
                     *
                     * // The `_.matchesProperty` iteratee shorthand.
                     * _.filter(users, _.iteratee(['user', 'fred']));
                     * // => [{ 'user': 'fred', 'age': 40 }]
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.map(users, _.iteratee('user'));
                     * // => ['barney', 'fred']
                     *
                     * // Create custom iteratee shorthands.
                     * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
     *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
     *     return func.test(string);
     *   };
     * });
                     *
                     * _.filter(['abc', 'def'], /ef/);
                     * // => ['def']
                     */
                    function iteratee(func) {
                        return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
                    }

                    /**
                     * Creates a function that performs a partial deep comparison between a given
                     * object and `source`, returning `true` if the given object has equivalent
                     * property values, else `false`.
                     *
                     * **Note:** The created function is equivalent to `_.isMatch` with `source`
                     * partially applied.
                     *
                     * Partial comparisons will match empty array and empty object `source`
                     * values against any array or object value, respectively. See `_.isEqual`
                     * for a list of supported value comparisons.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Util
                     * @param {Object} source The object of property values to match.
                     * @returns {Function} Returns the new spec function.
                     * @example
                     *
                     * var objects = [
                     *   { 'a': 1, 'b': 2, 'c': 3 },
                     *   { 'a': 4, 'b': 5, 'c': 6 }
                     * ];
                     *
                     * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
                     * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
                     */
                    function matches(source) {
                        return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
                    }

                    /**
                     * Creates a function that performs a partial deep comparison between the
                     * value at `path` of a given object to `srcValue`, returning `true` if the
                     * object value is equivalent, else `false`.
                     *
                     * **Note:** Partial comparisons will match empty array and empty object
                     * `srcValue` values against any array or object value, respectively. See
                     * `_.isEqual` for a list of supported value comparisons.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.2.0
                     * @category Util
                     * @param {Array|string} path The path of the property to get.
                     * @param {*} srcValue The value to match.
                     * @returns {Function} Returns the new spec function.
                     * @example
                     *
                     * var objects = [
                     *   { 'a': 1, 'b': 2, 'c': 3 },
                     *   { 'a': 4, 'b': 5, 'c': 6 }
                     * ];
                     *
                     * _.find(objects, _.matchesProperty('a', 4));
                     * // => { 'a': 4, 'b': 5, 'c': 6 }
                     */
                    function matchesProperty(path, srcValue) {
                        return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
                    }

                    /**
                     * Creates a function that invokes the method at `path` of a given object.
                     * Any additional arguments are provided to the invoked method.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.7.0
                     * @category Util
                     * @param {Array|string} path The path of the method to invoke.
                     * @param {...*} [args] The arguments to invoke the method with.
                     * @returns {Function} Returns the new invoker function.
                     * @example
                     *
                     * var objects = [
                     *   { 'a': { 'b': _.constant(2) } },
                     *   { 'a': { 'b': _.constant(1) } }
                     * ];
                     *
                     * _.map(objects, _.method('a.b'));
                     * // => [2, 1]
                     *
                     * _.map(objects, _.method(['a', 'b']));
                     * // => [2, 1]
                     */
                    var method = baseRest(function(path, args) {
                        return function(object) {
                            return baseInvoke(object, path, args);
                        };
                    });

                    /**
                     * The opposite of `_.method`; this method creates a function that invokes
                     * the method at a given path of `object`. Any additional arguments are
                     * provided to the invoked method.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.7.0
                     * @category Util
                     * @param {Object} object The object to query.
                     * @param {...*} [args] The arguments to invoke the method with.
                     * @returns {Function} Returns the new invoker function.
                     * @example
                     *
                     * var array = _.times(3, _.constant),
                     *     object = { 'a': array, 'b': array, 'c': array };
                     *
                     * _.map(['a[2]', 'c[0]'], _.methodOf(object));
                     * // => [2, 0]
                     *
                     * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
                     * // => [2, 0]
                     */
                    var methodOf = baseRest(function(object, args) {
                        return function(path) {
                            return baseInvoke(object, path, args);
                        };
                    });

                    /**
                     * Adds all own enumerable string keyed function properties of a source
                     * object to the destination object. If `object` is a function, then methods
                     * are added to its prototype as well.
                     *
                     * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
                     * avoid conflicts caused by modifying the original.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Util
                     * @param {Function|Object} [object=lodash] The destination object.
                     * @param {Object} source The object of functions to add.
                     * @param {Object} [options={}] The options object.
                     * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
                     * @returns {Function|Object} Returns `object`.
                     * @example
                     *
                     * function vowels(string) {
     *   return _.filter(string, function(v) {
     *     return /[aeiou]/i.test(v);
     *   });
     * }
                     *
                     * _.mixin({ 'vowels': vowels });
                     * _.vowels('fred');
                     * // => ['e']
                     *
                     * _('fred').vowels().value();
                     * // => ['e']
                     *
                     * _.mixin({ 'vowels': vowels }, { 'chain': false });
                     * _('fred').vowels();
                     * // => ['e']
                     */
                    function mixin(object, source, options) {
                        var props = keys(source),
                            methodNames = baseFunctions(source, props);

                        if (options == null &&
                            !(isObject(source) && (methodNames.length || !props.length))) {
                            options = source;
                            source = object;
                            object = this;
                            methodNames = baseFunctions(source, keys(source));
                        }
                        var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
                            isFunc = isFunction(object);

                        arrayEach(methodNames, function(methodName) {
                            var func = source[methodName];
                            object[methodName] = func;
                            if (isFunc) {
                                object.prototype[methodName] = function() {
                                    var chainAll = this.__chain__;
                                    if (chain || chainAll) {
                                        var result = object(this.__wrapped__),
                                            actions = result.__actions__ = copyArray(this.__actions__);

                                        actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
                                        result.__chain__ = chainAll;
                                        return result;
                                    }
                                    return func.apply(object, arrayPush([this.value()], arguments));
                                };
                            }
                        });

                        return object;
                    }

                    /**
                     * Reverts the `_` variable to its previous value and returns a reference to
                     * the `lodash` function.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Util
                     * @returns {Function} Returns the `lodash` function.
                     * @example
                     *
                     * var lodash = _.noConflict();
                     */
                    function noConflict() {
                        if (root._ === this) {
                            root._ = oldDash;
                        }
                        return this;
                    }

                    /**
                     * This method returns `undefined`.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.3.0
                     * @category Util
                     * @example
                     *
                     * _.times(2, _.noop);
                     * // => [undefined, undefined]
                     */
                    function noop() {
                        // No operation performed.
                    }

                    /**
                     * Creates a function that gets the argument at index `n`. If `n` is negative,
                     * the nth argument from the end is returned.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {number} [n=0] The index of the argument to return.
                     * @returns {Function} Returns the new pass-thru function.
                     * @example
                     *
                     * var func = _.nthArg(1);
                     * func('a', 'b', 'c', 'd');
                     * // => 'b'
                     *
                     * var func = _.nthArg(-2);
                     * func('a', 'b', 'c', 'd');
                     * // => 'c'
                     */
                    function nthArg(n) {
                        n = toInteger(n);
                        return baseRest(function(args) {
                            return baseNth(args, n);
                        });
                    }

                    /**
                     * Creates a function that invokes `iteratees` with the arguments it receives
                     * and returns their results.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {...(Function|Function[])} [iteratees=[_.identity]]
                     *  The iteratees to invoke.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * var func = _.over([Math.max, Math.min]);
                     *
                     * func(1, 2, 3, 4);
                     * // => [4, 1]
                     */
                    var over = createOver(arrayMap);

                    /**
                     * Creates a function that checks if **all** of the `predicates` return
                     * truthy when invoked with the arguments it receives.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {...(Function|Function[])} [predicates=[_.identity]]
                     *  The predicates to check.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * var func = _.overEvery([Boolean, isFinite]);
                     *
                     * func('1');
                     * // => true
                     *
                     * func(null);
                     * // => false
                     *
                     * func(NaN);
                     * // => false
                     */
                    var overEvery = createOver(arrayEvery);

                    /**
                     * Creates a function that checks if **any** of the `predicates` return
                     * truthy when invoked with the arguments it receives.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {...(Function|Function[])} [predicates=[_.identity]]
                     *  The predicates to check.
                     * @returns {Function} Returns the new function.
                     * @example
                     *
                     * var func = _.overSome([Boolean, isFinite]);
                     *
                     * func('1');
                     * // => true
                     *
                     * func(null);
                     * // => true
                     *
                     * func(NaN);
                     * // => false
                     */
                    var overSome = createOver(arraySome);

                    /**
                     * Creates a function that returns the value at `path` of a given object.
                     *
                     * @static
                     * @memberOf _
                     * @since 2.4.0
                     * @category Util
                     * @param {Array|string} path The path of the property to get.
                     * @returns {Function} Returns the new accessor function.
                     * @example
                     *
                     * var objects = [
                     *   { 'a': { 'b': 2 } },
                     *   { 'a': { 'b': 1 } }
                     * ];
                     *
                     * _.map(objects, _.property('a.b'));
                     * // => [2, 1]
                     *
                     * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
                     * // => [1, 2]
                     */
                    function property(path) {
                        return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
                    }

                    /**
                     * The opposite of `_.property`; this method creates a function that returns
                     * the value at a given path of `object`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.0.0
                     * @category Util
                     * @param {Object} object The object to query.
                     * @returns {Function} Returns the new accessor function.
                     * @example
                     *
                     * var array = [0, 1, 2],
                     *     object = { 'a': array, 'b': array, 'c': array };
                     *
                     * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
                     * // => [2, 0]
                     *
                     * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
                     * // => [2, 0]
                     */
                    function propertyOf(object) {
                        return function(path) {
                            return object == null ? undefined : baseGet(object, path);
                        };
                    }

                    /**
                     * Creates an array of numbers (positive and/or negative) progressing from
                     * `start` up to, but not including, `end`. A step of `-1` is used if a negative
                     * `start` is specified without an `end` or `step`. If `end` is not specified,
                     * it's set to `start` with `start` then set to `0`.
                     *
                     * **Note:** JavaScript follows the IEEE-754 standard for resolving
                     * floating-point values which can produce unexpected results.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Util
                     * @param {number} [start=0] The start of the range.
                     * @param {number} end The end of the range.
                     * @param {number} [step=1] The value to increment or decrement by.
                     * @returns {Array} Returns the range of numbers.
                     * @see _.inRange, _.rangeRight
                     * @example
                     *
                     * _.range(4);
                     * // => [0, 1, 2, 3]
                     *
                     * _.range(-4);
                     * // => [0, -1, -2, -3]
                     *
                     * _.range(1, 5);
                     * // => [1, 2, 3, 4]
                     *
                     * _.range(0, 20, 5);
                     * // => [0, 5, 10, 15]
                     *
                     * _.range(0, -4, -1);
                     * // => [0, -1, -2, -3]
                     *
                     * _.range(1, 4, 0);
                     * // => [1, 1, 1]
                     *
                     * _.range(0);
                     * // => []
                     */
                    var range = createRange();

                    /**
                     * This method is like `_.range` except that it populates values in
                     * descending order.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {number} [start=0] The start of the range.
                     * @param {number} end The end of the range.
                     * @param {number} [step=1] The value to increment or decrement by.
                     * @returns {Array} Returns the range of numbers.
                     * @see _.inRange, _.range
                     * @example
                     *
                     * _.rangeRight(4);
                     * // => [3, 2, 1, 0]
                     *
                     * _.rangeRight(-4);
                     * // => [-3, -2, -1, 0]
                     *
                     * _.rangeRight(1, 5);
                     * // => [4, 3, 2, 1]
                     *
                     * _.rangeRight(0, 20, 5);
                     * // => [15, 10, 5, 0]
                     *
                     * _.rangeRight(0, -4, -1);
                     * // => [-3, -2, -1, 0]
                     *
                     * _.rangeRight(1, 4, 0);
                     * // => [1, 1, 1]
                     *
                     * _.rangeRight(0);
                     * // => []
                     */
                    var rangeRight = createRange(true);

                    /**
                     * This method returns a new empty array.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.13.0
                     * @category Util
                     * @returns {Array} Returns the new empty array.
                     * @example
                     *
                     * var arrays = _.times(2, _.stubArray);
                     *
                     * console.log(arrays);
                     * // => [[], []]
                     *
                     * console.log(arrays[0] === arrays[1]);
                     * // => false
                     */
                    function stubArray() {
                        return [];
                    }

                    /**
                     * This method returns `false`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.13.0
                     * @category Util
                     * @returns {boolean} Returns `false`.
                     * @example
                     *
                     * _.times(2, _.stubFalse);
                     * // => [false, false]
                     */
                    function stubFalse() {
                        return false;
                    }

                    /**
                     * This method returns a new empty object.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.13.0
                     * @category Util
                     * @returns {Object} Returns the new empty object.
                     * @example
                     *
                     * var objects = _.times(2, _.stubObject);
                     *
                     * console.log(objects);
                     * // => [{}, {}]
                     *
                     * console.log(objects[0] === objects[1]);
                     * // => false
                     */
                    function stubObject() {
                        return {};
                    }

                    /**
                     * This method returns an empty string.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.13.0
                     * @category Util
                     * @returns {string} Returns the empty string.
                     * @example
                     *
                     * _.times(2, _.stubString);
                     * // => ['', '']
                     */
                    function stubString() {
                        return '';
                    }

                    /**
                     * This method returns `true`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.13.0
                     * @category Util
                     * @returns {boolean} Returns `true`.
                     * @example
                     *
                     * _.times(2, _.stubTrue);
                     * // => [true, true]
                     */
                    function stubTrue() {
                        return true;
                    }

                    /**
                     * Invokes the iteratee `n` times, returning an array of the results of
                     * each invocation. The iteratee is invoked with one argument; (index).
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Util
                     * @param {number} n The number of times to invoke `iteratee`.
                     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
                     * @returns {Array} Returns the array of results.
                     * @example
                     *
                     * _.times(3, String);
                     * // => ['0', '1', '2']
                     *
                     *  _.times(4, _.constant(0));
                     * // => [0, 0, 0, 0]
                     */
                    function times(n, iteratee) {
                        n = toInteger(n);
                        if (n < 1 || n > MAX_SAFE_INTEGER) {
                            return [];
                        }
                        var index = MAX_ARRAY_LENGTH,
                            length = nativeMin(n, MAX_ARRAY_LENGTH);

                        iteratee = getIteratee(iteratee);
                        n -= MAX_ARRAY_LENGTH;

                        var result = baseTimes(length, iteratee);
                        while (++index < n) {
                            iteratee(index);
                        }
                        return result;
                    }

                    /**
                     * Converts `value` to a property path array.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Util
                     * @param {*} value The value to convert.
                     * @returns {Array} Returns the new property path array.
                     * @example
                     *
                     * _.toPath('a.b.c');
                     * // => ['a', 'b', 'c']
                     *
                     * _.toPath('a[0].b.c');
                     * // => ['a', '0', 'b', 'c']
                     */
                    function toPath(value) {
                        if (isArray(value)) {
                            return arrayMap(value, toKey);
                        }
                        return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
                    }

                    /**
                     * Generates a unique ID. If `prefix` is given, the ID is appended to it.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Util
                     * @param {string} [prefix=''] The value to prefix the ID with.
                     * @returns {string} Returns the unique ID.
                     * @example
                     *
                     * _.uniqueId('contact_');
                     * // => 'contact_104'
                     *
                     * _.uniqueId();
                     * // => '105'
                     */
                    function uniqueId(prefix) {
                        var id = ++idCounter;
                        return toString(prefix) + id;
                    }

                    /*------------------------------------------------------------------------*/

                    /**
                     * Adds two numbers.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.4.0
                     * @category Math
                     * @param {number} augend The first number in an addition.
                     * @param {number} addend The second number in an addition.
                     * @returns {number} Returns the total.
                     * @example
                     *
                     * _.add(6, 4);
                     * // => 10
                     */
                    var add = createMathOperation(function(augend, addend) {
                        return augend + addend;
                    }, 0);

                    /**
                     * Computes `number` rounded up to `precision`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.10.0
                     * @category Math
                     * @param {number} number The number to round up.
                     * @param {number} [precision=0] The precision to round up to.
                     * @returns {number} Returns the rounded up number.
                     * @example
                     *
                     * _.ceil(4.006);
                     * // => 5
                     *
                     * _.ceil(6.004, 2);
                     * // => 6.01
                     *
                     * _.ceil(6040, -2);
                     * // => 6100
                     */
                    var ceil = createRound('ceil');

                    /**
                     * Divide two numbers.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.7.0
                     * @category Math
                     * @param {number} dividend The first number in a division.
                     * @param {number} divisor The second number in a division.
                     * @returns {number} Returns the quotient.
                     * @example
                     *
                     * _.divide(6, 4);
                     * // => 1.5
                     */
                    var divide = createMathOperation(function(dividend, divisor) {
                        return dividend / divisor;
                    }, 1);

                    /**
                     * Computes `number` rounded down to `precision`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.10.0
                     * @category Math
                     * @param {number} number The number to round down.
                     * @param {number} [precision=0] The precision to round down to.
                     * @returns {number} Returns the rounded down number.
                     * @example
                     *
                     * _.floor(4.006);
                     * // => 4
                     *
                     * _.floor(0.046, 2);
                     * // => 0.04
                     *
                     * _.floor(4060, -2);
                     * // => 4000
                     */
                    var floor = createRound('floor');

                    /**
                     * Computes the maximum value of `array`. If `array` is empty or falsey,
                     * `undefined` is returned.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @returns {*} Returns the maximum value.
                     * @example
                     *
                     * _.max([4, 2, 8, 6]);
                     * // => 8
                     *
                     * _.max([]);
                     * // => undefined
                     */
                    function max(array) {
                        return (array && array.length)
                            ? baseExtremum(array, identity, baseGt)
                            : undefined;
                    }

                    /**
                     * This method is like `_.max` except that it accepts `iteratee` which is
                     * invoked for each element in `array` to generate the criterion by which
                     * the value is ranked. The iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {*} Returns the maximum value.
                     * @example
                     *
                     * var objects = [{ 'n': 1 }, { 'n': 2 }];
                     *
                     * _.maxBy(objects, function(o) { return o.n; });
                     * // => { 'n': 2 }
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.maxBy(objects, 'n');
                     * // => { 'n': 2 }
                     */
                    function maxBy(array, iteratee) {
                        return (array && array.length)
                            ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
                            : undefined;
                    }

                    /**
                     * Computes the mean of the values in `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @returns {number} Returns the mean.
                     * @example
                     *
                     * _.mean([4, 2, 8, 6]);
                     * // => 5
                     */
                    function mean(array) {
                        return baseMean(array, identity);
                    }

                    /**
                     * This method is like `_.mean` except that it accepts `iteratee` which is
                     * invoked for each element in `array` to generate the value to be averaged.
                     * The iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.7.0
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {number} Returns the mean.
                     * @example
                     *
                     * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
                     *
                     * _.meanBy(objects, function(o) { return o.n; });
                     * // => 5
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.meanBy(objects, 'n');
                     * // => 5
                     */
                    function meanBy(array, iteratee) {
                        return baseMean(array, getIteratee(iteratee, 2));
                    }

                    /**
                     * Computes the minimum value of `array`. If `array` is empty or falsey,
                     * `undefined` is returned.
                     *
                     * @static
                     * @since 0.1.0
                     * @memberOf _
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @returns {*} Returns the minimum value.
                     * @example
                     *
                     * _.min([4, 2, 8, 6]);
                     * // => 2
                     *
                     * _.min([]);
                     * // => undefined
                     */
                    function min(array) {
                        return (array && array.length)
                            ? baseExtremum(array, identity, baseLt)
                            : undefined;
                    }

                    /**
                     * This method is like `_.min` except that it accepts `iteratee` which is
                     * invoked for each element in `array` to generate the criterion by which
                     * the value is ranked. The iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {*} Returns the minimum value.
                     * @example
                     *
                     * var objects = [{ 'n': 1 }, { 'n': 2 }];
                     *
                     * _.minBy(objects, function(o) { return o.n; });
                     * // => { 'n': 1 }
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.minBy(objects, 'n');
                     * // => { 'n': 1 }
                     */
                    function minBy(array, iteratee) {
                        return (array && array.length)
                            ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
                            : undefined;
                    }

                    /**
                     * Multiply two numbers.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.7.0
                     * @category Math
                     * @param {number} multiplier The first number in a multiplication.
                     * @param {number} multiplicand The second number in a multiplication.
                     * @returns {number} Returns the product.
                     * @example
                     *
                     * _.multiply(6, 4);
                     * // => 24
                     */
                    var multiply = createMathOperation(function(multiplier, multiplicand) {
                        return multiplier * multiplicand;
                    }, 1);

                    /**
                     * Computes `number` rounded to `precision`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.10.0
                     * @category Math
                     * @param {number} number The number to round.
                     * @param {number} [precision=0] The precision to round to.
                     * @returns {number} Returns the rounded number.
                     * @example
                     *
                     * _.round(4.006);
                     * // => 4
                     *
                     * _.round(4.006, 2);
                     * // => 4.01
                     *
                     * _.round(4060, -2);
                     * // => 4100
                     */
                    var round = createRound('round');

                    /**
                     * Subtract two numbers.
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Math
                     * @param {number} minuend The first number in a subtraction.
                     * @param {number} subtrahend The second number in a subtraction.
                     * @returns {number} Returns the difference.
                     * @example
                     *
                     * _.subtract(6, 4);
                     * // => 2
                     */
                    var subtract = createMathOperation(function(minuend, subtrahend) {
                        return minuend - subtrahend;
                    }, 0);

                    /**
                     * Computes the sum of the values in `array`.
                     *
                     * @static
                     * @memberOf _
                     * @since 3.4.0
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @returns {number} Returns the sum.
                     * @example
                     *
                     * _.sum([4, 2, 8, 6]);
                     * // => 20
                     */
                    function sum(array) {
                        return (array && array.length)
                            ? baseSum(array, identity)
                            : 0;
                    }

                    /**
                     * This method is like `_.sum` except that it accepts `iteratee` which is
                     * invoked for each element in `array` to generate the value to be summed.
                     * The iteratee is invoked with one argument: (value).
                     *
                     * @static
                     * @memberOf _
                     * @since 4.0.0
                     * @category Math
                     * @param {Array} array The array to iterate over.
                     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
                     * @returns {number} Returns the sum.
                     * @example
                     *
                     * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
                     *
                     * _.sumBy(objects, function(o) { return o.n; });
                     * // => 20
                     *
                     * // The `_.property` iteratee shorthand.
                     * _.sumBy(objects, 'n');
                     * // => 20
                     */
                    function sumBy(array, iteratee) {
                        return (array && array.length)
                            ? baseSum(array, getIteratee(iteratee, 2))
                            : 0;
                    }

                    /*------------------------------------------------------------------------*/

                    // Add methods that return wrapped values in chain sequences.
                    lodash.after = after;
                    lodash.ary = ary;
                    lodash.assign = assign;
                    lodash.assignIn = assignIn;
                    lodash.assignInWith = assignInWith;
                    lodash.assignWith = assignWith;
                    lodash.at = at;
                    lodash.before = before;
                    lodash.bind = bind;
                    lodash.bindAll = bindAll;
                    lodash.bindKey = bindKey;
                    lodash.castArray = castArray;
                    lodash.chain = chain;
                    lodash.chunk = chunk;
                    lodash.compact = compact;
                    lodash.concat = concat;
                    lodash.cond = cond;
                    lodash.conforms = conforms;
                    lodash.constant = constant;
                    lodash.countBy = countBy;
                    lodash.create = create;
                    lodash.curry = curry;
                    lodash.curryRight = curryRight;
                    lodash.debounce = debounce;
                    lodash.defaults = defaults;
                    lodash.defaultsDeep = defaultsDeep;
                    lodash.defer = defer;
                    lodash.delay = delay;
                    lodash.difference = difference;
                    lodash.differenceBy = differenceBy;
                    lodash.differenceWith = differenceWith;
                    lodash.drop = drop;
                    lodash.dropRight = dropRight;
                    lodash.dropRightWhile = dropRightWhile;
                    lodash.dropWhile = dropWhile;
                    lodash.fill = fill;
                    lodash.filter = filter;
                    lodash.flatMap = flatMap;
                    lodash.flatMapDeep = flatMapDeep;
                    lodash.flatMapDepth = flatMapDepth;
                    lodash.flatten = flatten;
                    lodash.flattenDeep = flattenDeep;
                    lodash.flattenDepth = flattenDepth;
                    lodash.flip = flip;
                    lodash.flow = flow;
                    lodash.flowRight = flowRight;
                    lodash.fromPairs = fromPairs;
                    lodash.functions = functions;
                    lodash.functionsIn = functionsIn;
                    lodash.groupBy = groupBy;
                    lodash.initial = initial;
                    lodash.intersection = intersection;
                    lodash.intersectionBy = intersectionBy;
                    lodash.intersectionWith = intersectionWith;
                    lodash.invert = invert;
                    lodash.invertBy = invertBy;
                    lodash.invokeMap = invokeMap;
                    lodash.iteratee = iteratee;
                    lodash.keyBy = keyBy;
                    lodash.keys = keys;
                    lodash.keysIn = keysIn;
                    lodash.map = map;
                    lodash.mapKeys = mapKeys;
                    lodash.mapValues = mapValues;
                    lodash.matches = matches;
                    lodash.matchesProperty = matchesProperty;
                    lodash.memoize = memoize;
                    lodash.merge = merge;
                    lodash.mergeWith = mergeWith;
                    lodash.method = method;
                    lodash.methodOf = methodOf;
                    lodash.mixin = mixin;
                    lodash.negate = negate;
                    lodash.nthArg = nthArg;
                    lodash.omit = omit;
                    lodash.omitBy = omitBy;
                    lodash.once = once;
                    lodash.orderBy = orderBy;
                    lodash.over = over;
                    lodash.overArgs = overArgs;
                    lodash.overEvery = overEvery;
                    lodash.overSome = overSome;
                    lodash.partial = partial;
                    lodash.partialRight = partialRight;
                    lodash.partition = partition;
                    lodash.pick = pick;
                    lodash.pickBy = pickBy;
                    lodash.property = property;
                    lodash.propertyOf = propertyOf;
                    lodash.pull = pull;
                    lodash.pullAll = pullAll;
                    lodash.pullAllBy = pullAllBy;
                    lodash.pullAllWith = pullAllWith;
                    lodash.pullAt = pullAt;
                    lodash.range = range;
                    lodash.rangeRight = rangeRight;
                    lodash.rearg = rearg;
                    lodash.reject = reject;
                    lodash.remove = remove;
                    lodash.rest = rest;
                    lodash.reverse = reverse;
                    lodash.sampleSize = sampleSize;
                    lodash.set = set;
                    lodash.setWith = setWith;
                    lodash.shuffle = shuffle;
                    lodash.slice = slice;
                    lodash.sortBy = sortBy;
                    lodash.sortedUniq = sortedUniq;
                    lodash.sortedUniqBy = sortedUniqBy;
                    lodash.split = split;
                    lodash.spread = spread;
                    lodash.tail = tail;
                    lodash.take = take;
                    lodash.takeRight = takeRight;
                    lodash.takeRightWhile = takeRightWhile;
                    lodash.takeWhile = takeWhile;
                    lodash.tap = tap;
                    lodash.throttle = throttle;
                    lodash.thru = thru;
                    lodash.toArray = toArray;
                    lodash.toPairs = toPairs;
                    lodash.toPairsIn = toPairsIn;
                    lodash.toPath = toPath;
                    lodash.toPlainObject = toPlainObject;
                    lodash.transform = transform;
                    lodash.unary = unary;
                    lodash.union = union;
                    lodash.unionBy = unionBy;
                    lodash.unionWith = unionWith;
                    lodash.uniq = uniq;
                    lodash.uniqBy = uniqBy;
                    lodash.uniqWith = uniqWith;
                    lodash.unset = unset;
                    lodash.unzip = unzip;
                    lodash.unzipWith = unzipWith;
                    lodash.update = update;
                    lodash.updateWith = updateWith;
                    lodash.values = values;
                    lodash.valuesIn = valuesIn;
                    lodash.without = without;
                    lodash.words = words;
                    lodash.wrap = wrap;
                    lodash.xor = xor;
                    lodash.xorBy = xorBy;
                    lodash.xorWith = xorWith;
                    lodash.zip = zip;
                    lodash.zipObject = zipObject;
                    lodash.zipObjectDeep = zipObjectDeep;
                    lodash.zipWith = zipWith;

                    // Add aliases.
                    lodash.entries = toPairs;
                    lodash.entriesIn = toPairsIn;
                    lodash.extend = assignIn;
                    lodash.extendWith = assignInWith;

                    // Add methods to `lodash.prototype`.
                    mixin(lodash, lodash);

                    /*------------------------------------------------------------------------*/

                    // Add methods that return unwrapped values in chain sequences.
                    lodash.add = add;
                    lodash.attempt = attempt;
                    lodash.camelCase = camelCase;
                    lodash.capitalize = capitalize;
                    lodash.ceil = ceil;
                    lodash.clamp = clamp;
                    lodash.clone = clone;
                    lodash.cloneDeep = cloneDeep;
                    lodash.cloneDeepWith = cloneDeepWith;
                    lodash.cloneWith = cloneWith;
                    lodash.conformsTo = conformsTo;
                    lodash.deburr = deburr;
                    lodash.defaultTo = defaultTo;
                    lodash.divide = divide;
                    lodash.endsWith = endsWith;
                    lodash.eq = eq;
                    lodash.escape = escape;
                    lodash.escapeRegExp = escapeRegExp;
                    lodash.every = every;
                    lodash.find = find;
                    lodash.findIndex = findIndex;
                    lodash.findKey = findKey;
                    lodash.findLast = findLast;
                    lodash.findLastIndex = findLastIndex;
                    lodash.findLastKey = findLastKey;
                    lodash.floor = floor;
                    lodash.forEach = forEach;
                    lodash.forEachRight = forEachRight;
                    lodash.forIn = forIn;
                    lodash.forInRight = forInRight;
                    lodash.forOwn = forOwn;
                    lodash.forOwnRight = forOwnRight;
                    lodash.get = get;
                    lodash.gt = gt;
                    lodash.gte = gte;
                    lodash.has = has;
                    lodash.hasIn = hasIn;
                    lodash.head = head;
                    lodash.identity = identity;
                    lodash.includes = includes;
                    lodash.indexOf = indexOf;
                    lodash.inRange = inRange;
                    lodash.invoke = invoke;
                    lodash.isArguments = isArguments;
                    lodash.isArray = isArray;
                    lodash.isArrayBuffer = isArrayBuffer;
                    lodash.isArrayLike = isArrayLike;
                    lodash.isArrayLikeObject = isArrayLikeObject;
                    lodash.isBoolean = isBoolean;
                    lodash.isBuffer = isBuffer;
                    lodash.isDate = isDate;
                    lodash.isElement = isElement;
                    lodash.isEmpty = isEmpty;
                    lodash.isEqual = isEqual;
                    lodash.isEqualWith = isEqualWith;
                    lodash.isError = isError;
                    lodash.isFinite = isFinite;
                    lodash.isFunction = isFunction;
                    lodash.isInteger = isInteger;
                    lodash.isLength = isLength;
                    lodash.isMap = isMap;
                    lodash.isMatch = isMatch;
                    lodash.isMatchWith = isMatchWith;
                    lodash.isNaN = isNaN;
                    lodash.isNative = isNative;
                    lodash.isNil = isNil;
                    lodash.isNull = isNull;
                    lodash.isNumber = isNumber;
                    lodash.isObject = isObject;
                    lodash.isObjectLike = isObjectLike;
                    lodash.isPlainObject = isPlainObject;
                    lodash.isRegExp = isRegExp;
                    lodash.isSafeInteger = isSafeInteger;
                    lodash.isSet = isSet;
                    lodash.isString = isString;
                    lodash.isSymbol = isSymbol;
                    lodash.isTypedArray = isTypedArray;
                    lodash.isUndefined = isUndefined;
                    lodash.isWeakMap = isWeakMap;
                    lodash.isWeakSet = isWeakSet;
                    lodash.join = join;
                    lodash.kebabCase = kebabCase;
                    lodash.last = last;
                    lodash.lastIndexOf = lastIndexOf;
                    lodash.lowerCase = lowerCase;
                    lodash.lowerFirst = lowerFirst;
                    lodash.lt = lt;
                    lodash.lte = lte;
                    lodash.max = max;
                    lodash.maxBy = maxBy;
                    lodash.mean = mean;
                    lodash.meanBy = meanBy;
                    lodash.min = min;
                    lodash.minBy = minBy;
                    lodash.stubArray = stubArray;
                    lodash.stubFalse = stubFalse;
                    lodash.stubObject = stubObject;
                    lodash.stubString = stubString;
                    lodash.stubTrue = stubTrue;
                    lodash.multiply = multiply;
                    lodash.nth = nth;
                    lodash.noConflict = noConflict;
                    lodash.noop = noop;
                    lodash.now = now;
                    lodash.pad = pad;
                    lodash.padEnd = padEnd;
                    lodash.padStart = padStart;
                    lodash.parseInt = parseInt;
                    lodash.random = random;
                    lodash.reduce = reduce;
                    lodash.reduceRight = reduceRight;
                    lodash.repeat = repeat;
                    lodash.replace = replace;
                    lodash.result = result;
                    lodash.round = round;
                    lodash.runInContext = runInContext;
                    lodash.sample = sample;
                    lodash.size = size;
                    lodash.snakeCase = snakeCase;
                    lodash.some = some;
                    lodash.sortedIndex = sortedIndex;
                    lodash.sortedIndexBy = sortedIndexBy;
                    lodash.sortedIndexOf = sortedIndexOf;
                    lodash.sortedLastIndex = sortedLastIndex;
                    lodash.sortedLastIndexBy = sortedLastIndexBy;
                    lodash.sortedLastIndexOf = sortedLastIndexOf;
                    lodash.startCase = startCase;
                    lodash.startsWith = startsWith;
                    lodash.subtract = subtract;
                    lodash.sum = sum;
                    lodash.sumBy = sumBy;
                    lodash.template = template;
                    lodash.times = times;
                    lodash.toFinite = toFinite;
                    lodash.toInteger = toInteger;
                    lodash.toLength = toLength;
                    lodash.toLower = toLower;
                    lodash.toNumber = toNumber;
                    lodash.toSafeInteger = toSafeInteger;
                    lodash.toString = toString;
                    lodash.toUpper = toUpper;
                    lodash.trim = trim;
                    lodash.trimEnd = trimEnd;
                    lodash.trimStart = trimStart;
                    lodash.truncate = truncate;
                    lodash.unescape = unescape;
                    lodash.uniqueId = uniqueId;
                    lodash.upperCase = upperCase;
                    lodash.upperFirst = upperFirst;

                    // Add aliases.
                    lodash.each = forEach;
                    lodash.eachRight = forEachRight;
                    lodash.first = head;

                    mixin(lodash, (function() {
                        var source = {};
                        baseForOwn(lodash, function(func, methodName) {
                            if (!hasOwnProperty.call(lodash.prototype, methodName)) {
                                source[methodName] = func;
                            }
                        });
                        return source;
                    }()), { 'chain': false });

                    /*------------------------------------------------------------------------*/

                    /**
                     * The semantic version number.
                     *
                     * @static
                     * @memberOf _
                     * @type {string}
                     */
                    lodash.VERSION = VERSION;

                    // Assign default placeholders.
                    arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
                        lodash[methodName].placeholder = lodash;
                    });

                    // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
                    arrayEach(['drop', 'take'], function(methodName, index) {
                        LazyWrapper.prototype[methodName] = function(n) {
                            n = n === undefined ? 1 : nativeMax(toInteger(n), 0);

                            var result = (this.__filtered__ && !index)
                                ? new LazyWrapper(this)
                                : this.clone();

                            if (result.__filtered__) {
                                result.__takeCount__ = nativeMin(n, result.__takeCount__);
                            } else {
                                result.__views__.push({
                                    'size': nativeMin(n, MAX_ARRAY_LENGTH),
                                    'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
                                });
                            }
                            return result;
                        };

                        LazyWrapper.prototype[methodName + 'Right'] = function(n) {
                            return this.reverse()[methodName](n).reverse();
                        };
                    });

                    // Add `LazyWrapper` methods that accept an `iteratee` value.
                    arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
                        var type = index + 1,
                            isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;

                        LazyWrapper.prototype[methodName] = function(iteratee) {
                            var result = this.clone();
                            result.__iteratees__.push({
                                'iteratee': getIteratee(iteratee, 3),
                                'type': type
                            });
                            result.__filtered__ = result.__filtered__ || isFilter;
                            return result;
                        };
                    });

                    // Add `LazyWrapper` methods for `_.head` and `_.last`.
                    arrayEach(['head', 'last'], function(methodName, index) {
                        var takeName = 'take' + (index ? 'Right' : '');

                        LazyWrapper.prototype[methodName] = function() {
                            return this[takeName](1).value()[0];
                        };
                    });

                    // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
                    arrayEach(['initial', 'tail'], function(methodName, index) {
                        var dropName = 'drop' + (index ? '' : 'Right');

                        LazyWrapper.prototype[methodName] = function() {
                            return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
                        };
                    });

                    LazyWrapper.prototype.compact = function() {
                        return this.filter(identity);
                    };

                    LazyWrapper.prototype.find = function(predicate) {
                        return this.filter(predicate).head();
                    };

                    LazyWrapper.prototype.findLast = function(predicate) {
                        return this.reverse().find(predicate);
                    };

                    LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
                        if (typeof path == 'function') {
                            return new LazyWrapper(this);
                        }
                        return this.map(function(value) {
                            return baseInvoke(value, path, args);
                        });
                    });

                    LazyWrapper.prototype.reject = function(predicate) {
                        return this.filter(negate(getIteratee(predicate)));
                    };

                    LazyWrapper.prototype.slice = function(start, end) {
                        start = toInteger(start);

                        var result = this;
                        if (result.__filtered__ && (start > 0 || end < 0)) {
                            return new LazyWrapper(result);
                        }
                        if (start < 0) {
                            result = result.takeRight(-start);
                        } else if (start) {
                            result = result.drop(start);
                        }
                        if (end !== undefined) {
                            end = toInteger(end);
                            result = end < 0 ? result.dropRight(-end) : result.take(end - start);
                        }
                        return result;
                    };

                    LazyWrapper.prototype.takeRightWhile = function(predicate) {
                        return this.reverse().takeWhile(predicate).reverse();
                    };

                    LazyWrapper.prototype.toArray = function() {
                        return this.take(MAX_ARRAY_LENGTH);
                    };

                    // Add `LazyWrapper` methods to `lodash.prototype`.
                    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
                        var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
                            isTaker = /^(?:head|last)$/.test(methodName),
                            lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
                            retUnwrapped = isTaker || /^find/.test(methodName);

                        if (!lodashFunc) {
                            return;
                        }
                        lodash.prototype[methodName] = function() {
                            var value = this.__wrapped__,
                                args = isTaker ? [1] : arguments,
                                isLazy = value instanceof LazyWrapper,
                                iteratee = args[0],
                                useLazy = isLazy || isArray(value);

                            var interceptor = function(value) {
                                var result = lodashFunc.apply(lodash, arrayPush([value], args));
                                return (isTaker && chainAll) ? result[0] : result;
                            };

                            if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
                                // Avoid lazy use if the iteratee has a "length" value other than `1`.
                                isLazy = useLazy = false;
                            }
                            var chainAll = this.__chain__,
                                isHybrid = !!this.__actions__.length,
                                isUnwrapped = retUnwrapped && !chainAll,
                                onlyLazy = isLazy && !isHybrid;

                            if (!retUnwrapped && useLazy) {
                                value = onlyLazy ? value : new LazyWrapper(this);
                                var result = func.apply(value, args);
                                result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
                                return new LodashWrapper(result, chainAll);
                            }
                            if (isUnwrapped && onlyLazy) {
                                return func.apply(this, args);
                            }
                            result = this.thru(interceptor);
                            return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
                        };
                    });

                    // Add `Array` methods to `lodash.prototype`.
                    arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
                        var func = arrayProto[methodName],
                            chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
                            retUnwrapped = /^(?:pop|shift)$/.test(methodName);

                        lodash.prototype[methodName] = function() {
                            var args = arguments;
                            if (retUnwrapped && !this.__chain__) {
                                var value = this.value();
                                return func.apply(isArray(value) ? value : [], args);
                            }
                            return this[chainName](function(value) {
                                return func.apply(isArray(value) ? value : [], args);
                            });
                        };
                    });

                    // Map minified method names to their real names.
                    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
                        var lodashFunc = lodash[methodName];
                        if (lodashFunc) {
                            var key = (lodashFunc.name + ''),
                                names = realNames[key] || (realNames[key] = []);

                            names.push({ 'name': methodName, 'func': lodashFunc });
                        }
                    });

                    realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
                        'name': 'wrapper',
                        'func': undefined
                    }];

                    // Add methods to `LazyWrapper`.
                    LazyWrapper.prototype.clone = lazyClone;
                    LazyWrapper.prototype.reverse = lazyReverse;
                    LazyWrapper.prototype.value = lazyValue;

                    // Add chain sequence methods to the `lodash` wrapper.
                    lodash.prototype.at = wrapperAt;
                    lodash.prototype.chain = wrapperChain;
                    lodash.prototype.commit = wrapperCommit;
                    lodash.prototype.next = wrapperNext;
                    lodash.prototype.plant = wrapperPlant;
                    lodash.prototype.reverse = wrapperReverse;
                    lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;

                    // Add lazy aliases.
                    lodash.prototype.first = lodash.prototype.head;

                    if (symIterator) {
                        lodash.prototype[symIterator] = wrapperToIterator;
                    }
                    return lodash;
                });

                /*--------------------------------------------------------------------------*/

                // Export lodash.
                var _ = runInContext();

                // Some AMD build optimizers, like r.js, check for condition patterns like:
                if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
                    // Expose Lodash on the global object to prevent errors when Lodash is
                    // loaded by a script tag in the presence of an AMD loader.
                    // See http://requirejs.org/docs/errors.html#mismatch for more details.
                    // Use `_.noConflict` to remove Lodash from the global object.
                    root._ = _;

                    // Define as an anonymous module so, through path mapping, it can be
                    // referenced as the "underscore" module.
                    define(function() {
                        return _;
                    });
                }
                // Check for `exports` after `define` in case a build optimizer adds it.
                else if (freeModule) {
                    // Export for Node.js.
                    (freeModule.exports = _)._ = _;
                    // Export for CommonJS support.
                    freeExports._ = _;
                }
                else {
                    // Export to the global object.
                    root._ = _;
                }
            }.call(this));

        }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{}]},{},[1])(1)
});